1
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Installation Manual
Installation and Appliance Setup
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
NOTICE: DO NOT discard this manual!
In the Commonwealth of Massachusetts installation must be
performed by a licensed plumber or gas tter.
See Table of Contents for location of additional Commonwealth
of Massachusetts requirements.
• DO NOT store or use gasoline or other am-
mable vapors and liquids in the vicinity of this
or any other appliance.
• What to do if you smell gas
- DO NOT try to light any appliance.
- DO NOT touch any electrical switch. DO
NOT use any phone in your building.
- Leave the building immediately.
- Immediately call your gas supplier from
a neighbor’s phone. Follow the gas sup-
plier’s instructions.
- If you cannot reach your gas supplier, call
the re department.
• Installation and service must be performed
by a qualied installer, service agency, or the
gas supplier.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
This appliance may be installed as an OEM
installation in manufactured home (USA
only) or mobile home and must be installed
in accordance with the manufacturer’s
instructions and the Manufactured Home
Construction and Safety Standard, Title 24
CFR, Part 3280 in the United States, or the
Standard for Installation in Mobile Homes,
CAN/CSA Z240 MH Series, in Canada.
This appliance is only for use with the type(s)
of gas indicated on the rating plate. This
appliance is not convertible for use with other
gases, unless a certied kit is used.
Models: ODFORTG-36
FORTRESS
SERIES
DANGER
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of
burns from the hot viewing glass is provided
with this appliance and must be installed for
the protection of children and other at-risk
individuals.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Used to address practices not related to personal injury.
Table of Contents
Installation Standard Work Checklist ....................3
1 Product Specic and Important Safety Information
A. Appliance Certication ............................4
B. Glass Specications ..............................4
C. BTU Specications ...............................4
D. High Altitude Installations .......................... 4
E. Non-Combustible Materials Specication. . . . . . . . . . . . . . 4
F. Combustible Materials Specication .................4
G. Electrical Codes .................................4
H. Requirements for the Commonwealth of Massachusetts . . 5
2 Getting Started
A. Design and Installation Considerations ...............6
B. Good Faith Wall Surface/TV Guidelines ..............6
C. Tools and Supplies Needed ........................6
D. Inspect Appliance and Components .................. 7
3 Framing and Clearances
A. Appliance/Decorative Front Dimension/Weight Diagrams . 8
B. Clearances to Combustibles. .......................9
C. Mantel Combustibles. .............................9
D. Constructing the Appliance Chase .................. 12
E. Hearth Extension ...............................13
4 Termination Location and Vent Information
A. Vent Termination Minimum Clearances .............. 14
B. Chimney Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
C. Approved Pipe .................................16
D. Use of Elbows .................................17
E. Measuring Standards ............................18
F. Vent Diagrams .................................18
5 Venting Installation
A. Installation Precautions ...........................19
B. Installation Planning .............................20
C. Installation Instructions ...........................20
6 Appliance Preparation
A. Securing and Leveling the Appliance ................27
7 Venting and Chimneys
A. Assemble Vent Sections .........................28
B. Assemble Slip Sections ..........................29
C. Secure the Vent Sections .........................29
D. Disassemble Vent Sections .......................30
E. Vertical Termination Requirements ..................30
F. Horizontal Termination Requirements ............... 32
8 Electrical Information
A. General Information .............................33
B. Wiring Requirements ............................34
9 Gas Information
A. Fuel Conversion ................................35
B. Gas Pressure ..................................35
C. Gas Connection ................................35
D. High Altitude Installations ......................... 35
10 Finishing - Final Installation
A. Facing Material .................................36
B. Installation Instructions for Outdoor Side .............36
C. Log Placement Instructions .......................42
11 Reference Materials
A. Vent Components Diagrams ......................45
B. Accessories ...................................52
= Contains updated information.
►
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Installation Standard Work Checklist
Customer:
Lot/Address:
Model (circle one): ODFORTG-36
Date Installed:
Location of Fireplace:
Installer:
Dealer/Distributor Phone #
Serial #:
Comments Communicated to party responsible ____________________ by ______________________on ___________
(Builder / Gen. Contractor/) (Installer) (Date)
= Contains updated information.
Hearth & Home Technologies recommends the following:
• Photographing the installation and copying this checklist for your le.
• That this checklist remain visible at all times on the appliance until the installation is complete.
This standard work checklist is to be used by the installer in conjunction with, not instead of, the instructions contained in
this installation manual.
WARNING! Risk of Fire or Explosion! Failure to install appliance according to these instructions can lead to a
re or explosion.
ATTENTION INSTALLER:
Follow this Standard Work Checklist
Appliance Install Information YES IF NO, WHY?
Veried clearances to combustibles requirements are maintained. (Pg. 9-10) ___________________
Veried that the chase is insulated and sealed. (Pg. 9) ___________________
Veried mantel and wall clearance requirements are maintained. (Pg. 9) ___________________
Veried hearth extension requirements are maintained. (Pg. 11) __________________
Veried appliance is leveled and secured. (Pg. 25) ___________________
Venting/Chimney Section 7 (Pg. 26-30)
Veried venting conguration complies to vent diagrams. ___________________
Veried venting installed, locked and sealed/secured in place. ___________________
Veried venting meets clearance to combustible requirements. ___________________
Veried wall/ceiling restops are installed (if applicable). ___________________
Veried attic insulation shield is installed (if applicable). ___________________
Veried Exterior wall/Roof ashing is installed and sealed. ___________________
Veried termination cap is installed and sealed. ___________________
Electrical Section 8 (Pg. 31-32)
Veried unswitched power (110-120 VAC) provided to the appliance. ___________________
Veried wall switch wires are properly installed (if applicable). ___________________
Gas Section 9 (Pg. 33)
Veried appliance is using proper fuel type. ___________________
If converted, veried proper fuel conversion kit was used. ___________________
Veried that gas components (ttings, pressure taps, etc) are leak free and replace is
operating under correct pressures. ___________________
Finishing Section 10 (Pg. 34-40)
Veried that nish material does not interfere with install/operation of decorative front. ___________________
Veried combustible materials are not installed in non-combustible areas. ___________________
Veried all clearances meet installation manual requirements. ___________________
Veried mantels/wall projections comply with installation manual requirements. ___________________
Veried all packaging and protective materials are removed (inside & outside of appliance). ___________________
Veried Glowing Embers and logs installed correctly. ___________________
Veried xed glass assembly installed and secured. ___________________
Veried remote control has been programmed and is fully functional. ___________________
Veried proper air shutter setting for installation type and vent conguration. ___________________
Manual bag and all of its contents are removed from inside/under
the appliance and given to party responsible for use and operation. ___________________
4602-902 12/16
Comments: Further description of the issues, who is responsible (Installer/ Builder/ Other Trades, etc) and corrective
action needed ____________________________________________________________________________________
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Glass Specications
This appliance is equipped with ceramic glass that is
used on the inside glass door frames attached to the
rebox. Replace glass only with ceramic glass. The out-
door glass in the black frame screwed to the Stainless
Steel frame is tempered glass. Replace with tempered
glass. Please contact your dealer for replacement glass.
This product is listed to ANSI standards for “Vented Gas
Fireplace Heaters” and applicable sections of “Gas Burn-
ing Heating Appliances for Manufactured Homes and
Recreational Vehicles”, and “Gas Fired Appliances for
Use at High Altitudes”.
A. Appliance Certication
D. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certied without a reduc-
tion of input rate for elevations up to 4500 feet (1370
m) above sea level. Please consult provincial and/or
local authorities having jurisdiction for installations
at elevations above 4500 feet (1370 m).
Check with your local gas utility to determine proper ori-
ce size.
E. Non-Combustible Materials Specication
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in
a Vertical Tube Furnace at 750 ºC shall be considered
non-combustible materials.
F. Combustible Materials Specication
Materials made of or surfaced with wood, compressed pa-
per, plant bers, plastics, or other material that can ignite
and burn, whether ame proofed or not, or plastered or
unplastered shall be considered combustible materials.
G. Electrical Codes
NOTICE: This appliance must be electrically wired
and grounded in accordance with local codes or, in the
absence of local codes, with National Electric Code
ANSI/NFPA 70-latest edition or the Canadian Electric
Code CSA C22.1.
• A 110-120 VAC circuit for this product must be pro-
tected with ground-fault circuit-interrupter protection,
in compliance with the applicable electrical codes,
when it is installed in locations such as in bathrooms
or near sinks.
NOT INTENDED FOR USE AS A PRIMARY HEAT SOURCE.
This appliance is tested and approved as either supplemen-
tal room heat or as a decorative appliance. It should not be
factored as primary heat in residential heating calculations.
NOTICE: This installation must conform with local codes.
In the absence of local codes you must comply with the
National Fuel Gas Code, ANSI Z223.1-latest edition in
the U.S.A. and the CAN/CGA B149 Installation Codes in
Canada.
1 1
Product Specic and Important Safety Information
MODELS: ODFORTG-36
LABORATORY: CSA
TYPE: Vented Gas Fireplace Heater
STANDARD: CSA/ANSI-Z21.88:19 • CSA 2.33:19
C. BTU Specications
Models
(U.S. or Canada)
Maximum
Input
BTU/h
Minimum
Input
BTU/h
Middle
Orice
Size
(DMS)
Outer
Orice
Size
(DMS)
ODFORTG-36 (NG)
US
(0-4500FT)
56,000 38,000 #31 #46
ODFORTG-36 (LP)
US
(0-4500 FT)
56,000 44,000 #50 #56
WARNING: This product and the
fuels used to operate this product (liquid
propane or natural gas), and the products
of combustion of such fuels, can expose
you to chemicals including benzene, which
is known to the State of California to cause
cancer and reproductive harm. For more
information go to: www.P65Warnings.
ca.gov.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
H. Requirements for the Commonwealth of
Massachusetts
For all side wall horizontally vented gas fueled equipment
installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those
owned or operated by the Commonwealth and where the
side wall exhaust vent termination is less than seven (7)
feet above nished grade in the area of the venting, in-
cluding but not limited to decks and porches, the following
requirements shall be satised:
Installation of Carbon Monoxide Detectors
At the time of installation of the side wall horizontal vented
gas fueled equipment, the installing plumber or gas tter
shall observe that a hard wired carbon monoxide detector
with an alarm and battery back-up is installed on the oor
level where the gas equipment is to be installed. In addi-
tion, the installing plumber or gas tter shall observe that
a battery operated or hard wired carbon monoxide detec-
tor with an alarm is installed on each additional level of
the dwelling, building or structure served by the side wall
horizontal vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the services
of qualied licensed professionals for the installation of
hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fu-
eled equipment is installed in a crawl space or an attic,
the hard wired carbon monoxide detector with alarm and
battery back-up may be installed on the next adjacent
oor level.
In the event that the requirements of this subdivision can
not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that dur-
ing said thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.
Approved Carbon Monoxide Detectors
Each carbon monoxide detector as required in accor-
dance with the above provisions shall comply with NFPA
720 and be ANSI/UL 2034 listed and IAS certied.
Signage
A metal or plastic identication plate shall be permanent-
ly mounted to the exterior of the building at a minimum
height of eight (8) feet above grade directly in line with the
exhaust vent terminal for the horizontally vented gas fu-
eled heating appliance or equipment. The sign shall read,
in print size no less than one-half (1/2) in. in size, “GAS
VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OB-
STRUCTIONS”.
Inspection
The state or local gas inspector of the side wall horizon-
tally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector ob-
serves carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08(2)(a)1
through 4.
Exemptions
The following equipment is exempt from 248 CMR 5.08(2)
(a)1 through 4:
• The equipment listed in Chapter 10 entitled “Equipment
Not Required To Be Vented” in the most current edition
of NFPA 54 as adopted by the Board; and
• Product Approved side wall horizontally vented gas fu-
eled equipment installed in a room or structure separate
from the dwelling, building or structure used in whole or
in part for residential purposes.
MANUFACTURER REQUIREMENTS
Gas Equipment Venting System Provided
When the manufacturer of Product Approved side wall
horizontally vented gas equipment provides a venting
system design or venting system components with the
equipment, the instructions provided by the manufacturer
for installation of the equipment and the venting system
shall include:
• Detailed instructions for the installation of the venting
system design or the venting system components; and
• A complete parts list for the venting system design or
venting system.
Gas Equipment Venting System NOT Provided
When the manufacturer of a Product Approved side wall
horizontally vented gas fueled equipment does not pro-
vide the parts for venting the ue gases, but identies
“special venting systems”, the following requirements
shall be satised by the manufacturer:
• The referenced “special venting system” instructions
shall be included with the appliance or equipment in-
stallation instructions; and
• The “special venting systems” shall be Product Ap-
proved by the Board, and the instructions for that sys-
tem shall include a parts list and detailed installation
instructions.
A copy of all installation instructions for all Product Ap-
proved side wall horizontally vented gas fueled equip-
ment, all venting instructions, all parts lists for venting
instructions, and/or all venting design instructions shall
remain with the appliance or equipment at the completion
of the installation.
See Gas Connection section for additional Common-
wealth of Massachusetts requirements.
Note: The following requirements reference various
Massachusetts and national codes not contained in this
document.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
2 2
Getting Started
A. Design and Installation Considerations
Outdoor Lifestyles direct vent gas appliances are de-
signed to operate with all combustion air siphoned from
outside of the building and all exhaust gases expelled to
the outside. No additional outside air source is required.
Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance carrier,
local building inspector, re ofcials or authorities having
jurisdiction over restrictions, installation inspection and
permits.
Before installing, determine the following:
• Where the appliance is to be installed.
• The vent system conguration to be used.
• Gas supply piping requirements.
• Electrical wiring requirements.
• Framing and nishing details.
• Whether optional accessories—devices such a wall
switch or remote control—are desired.
C. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
Tape measure Framing material
Pliers Hammer
Phillips screwdriver Manometer
Gloves Framing square
Voltmeter Electric drill and bits (1/4 in.)
Plumb line Safety glasses
Level Reciprocating saw
Flat blade screwdriver
Non-corrosive leak check solution
1/2 - 3/4 in. length, #6 or #8 Self-drilling screws
Caulking material (300 ºF minimum continuous exposure
rating)
One 1/4 in. female connection (for optional fan).
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
service technician, service agency or your dealer.
Figure 2.1 Good Faith Wall Surface Temperatures Above Appliance
B. Good Faith Wall Surface/TV Guidelines
NOTICE: Temperatures listed above are taken with a
temperature measuring probe as prescribed by the test
standard used for appliance certication. Temperatures
on walls or mantels taken with an infrared thermometer
may yield increased temperatures of up to 30 degrees or
more depending on the thermometer settings and material
characteristics being measured.
MEASUREMENTS FROM
TOP EDGE OF THE OPENING
6 in.
18 in.
24 in.
30 in.
36 in.
TO CEILING
12 in.
APPLIANCE FRONT
FIREPLACE
OPENING
157 °F
129 °F
124 °F
123 °F
116 °F
105 °F
Installation and service of this appliance should be performed by
qualied personnel. Hearth & Home Technologies recommends
HHT Factory Trained or NFI certied professionals.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
D. Inspect Appliance and Components
• Carefully remove the appliance and components from
the packaging.
• The vent system components may be shipped in
separate packages.
• If packaged separately, the log set and appliance grate
must be installed.
• Report to your dealer any parts damaged in shipment,
particularly the condition of the glass.
• Read all of the instructions before starting the instal-
lation. Follow these instructions carefully during the
installation to ensure maximum safety and benet.
WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in-
complete or substitute components. Keep appliance dry.
Hearth & Home Technologies disclaims any responsibility
for, and the warranty will be voided by, the following actions:
• Installation and use of any damaged appliance or vent
system component.
• Modication of the appliance or vent system.
• Installation other than as instructed by Hearth & Home
Technologies.
• Improper positioning of the gas logs or the glass door.
• Installation and/or use of any component part not approved
by Hearth & Home Technologies.
Any such action may cause a re hazard.
WARNING! Risk of Fire, Explosion or Electric Shock!
DO NOT use this appliance if any part has been under
water. Call a qualied service technician to inspect the
appliance and to replace any part of the control system
and/or gas control which has been under water.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
3 3
Framing and Clearances
A. Appliance/Decorative Front Dimension/Weight Diagrams
Dimensions are actual appliance dimensions. Use for reference only. For framing dimensions and clearances refer to Section 5.
Figure 3.1 Appliance Dimensions
Location Inches Millimeters
G 7-3/8 187
H 9 228
I 12 305
J 23-13/16 605
K 24 609
L 25-5/8 650
Location Inches Millimeters
A 471/2 1207
B 39-3/8 1000
C 34-1/4 869
D 38-1/4 978
E 49-3/8 1254
F 44-3/8 1128
J
I
E
F
D
C
K
L
B
A
H
G
Outdoor Side
Indoor Side
Outdoor Side
Indoor Side
Appliance Dimensions Table
Model Pounds
ODFORTG-36 421
Appliance Weight
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Clearances to Combustibles
Fire Risk.
Follow these instructions carefully to ensure safe
installation. Failure to follow instructions exactly
can create a re hazard.
WARNING
The appliance cannot be installed on a carpet, tile or
other combustible material other than wood ooring. If
installed on carpet or vinyl ooring, the appliance shall
be installed on a metal, wood or noncombustible material
panel extending full width and depth of the appliance.
72 in.
(1829 mm)
Min.
Ceiling
12 in.
(305 mm)
Max. Depth
16 in.
(406 mm)
Min.
6 in.
(
152 mm)
Min.
Hearth 8 in. Min.
(203 mm)
Noncombustible
Hearth Minimum
Fireplace Opening
Combustible Mantel
Figure 3.2. Ceiling and Side Wall Clearance
C. Mantel Combustibles.
NOTE: The combustible area above the facing must not
protrude more than 1/2" from the facing. If it does, it is
considered a mantel and must meet the mantel require-
ments listed in this manual.
16 in.
12 in.
12 in.
6 in.
2-1/2
in.
Side
View
Noncombustible
Material to Top of
Standoffs
Top of Fireplace
Opening
10 in.
45°
1 in.
Stud
Finish Wall
Combustible
Material Area
Top View
2 in.
3 in.
4 in.
5 in.
6 in.
Figure 3.3. Mantel Clearance Indoor Side (Combustible Mantel)
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
45°
1 in.
Stud
Finish Wall
Combustible
Material Area
Top View
2 in.
3 in.
4 in.
5 in.
6 in.
Edge of
Outdoor Face
16 in.
12 in.
12 in.
6 in.
2-1/2
in.
Side View
Noncombustible
Material to Top of
Standoffs
10 in.
Upper Edge
of Top Trim
Figure 3.5. Mantel Clearance Outdoor Side (Combustible Mantel)
45°
1 in.
Stud
Finish Wall
Noncombustible
Material Area
Top View
2 in.
3 in.
1 in.
2 in.
6 in.
2 in.
12 in.
6 in.
2-1/2
in.
Side View
Noncombustible
Material to Top of
Standoffs
Top of Fireplace
Opening
Figure 3.4. Mantel Clearance Indoor Side (Noncombustible Man-
tel)
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
45°
1 in.
Stud
Finish Wall
Noncombustible
Material Area
Top View
2 in.
3 in.
1 in.
2 in.
Edge of
Outdoor Face
Figure 3.6. Mantel Clearance Outdoor Side (Noncombustible
Mantel)
6 in.
2 in.
12 in.
6 in.
2-1/2
in.
Side View
Noncombustible
Material to Top of
Standoffs
Upper Edge
of Top Trim
Fire Risk.
Never obstruct or modify the air inlet or outlet
grilles (louvers). This may create a re hazard
WARNING
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
D. Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should be enclosed inside the chase.
NOTICE: Treatment of ceiling restops and wall shield
restops and construction of the chase may vary with the
type of building. These instructions are not substitutes
for the requirements of local building codes. Therefore,
you MUST check local building codes to determine the
requirements to these steps.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.
Walls, ceiling, base plate and cantilever oor of the chase
should be insulated. Vapor and air inltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air inltration may be an issue, the inside surfaces may be
sheet rocked and taped (or an equivalent method may be
used) to achieve maximum air tightness.
NOTICE: Install appliance on hard metal or wood surfaces
extending full width and depth. DO NOT install directly
on carpeting, vinyl, tile or any combustible material other
than wood.
WARNING! Risk of Fire! Maintain specied air space
clearances to appliance and vent pipe:
• Insulation and other materials must be secured to prevent
accidental contact.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with replace or chimney.
• Failure to maintain airspace may cause overheating and
a re.
To further prevent drafts, the wall shield and ceiling re-
stops should be caulked with caulk with a minimum of
300ºF continuous exposure rating to seal gaps. Gas
line holes and other openings should be caulked with
caulk with a minimum of 300ºF continuous exposure rating
or stuffed with unfaced insulation. If the appliance is being
installed on a cement surface, a layer of plywood may be
placed underneath to prevent conducting cold up into the
room.
Figure 3.7 Clearances to Combustibles
F
E=33 in.
G
H
I
E=43 in.
MINIMUM FRAMING DIMENSIONS*
A B** C* D E F** G** H I
Rough
Opening
(Vent Pipe)
Rough
Opening
(Height)
Rough
Opening
(Depth)
Rough
Opening
(Width)
Clearance
to ceiling
from opening
Clearance
to ceiling
from top of
appliance
Combustible
Floor
Combustible
Flooring
Sides of
Appliance
Front or
Rear of
Appli-
ance
Inches 10 44-7/8 23 49-1/2 37-3/4 33-1/2 0 See Note Below 1 48
Millime-
ters
254 1140 584 1257 959 851 0 See Note Below 25 1219
* Adjust framing dimensions for interior sheathing (such as sheetrock)
** Fireplace may need to be elevated from the oor affecting framing height B, depending on hearth construction. See Section 3.D
for hearth and combustible oor requirements.
C
A
B
D
HEADER
DEPTH**
HEADER
DEPTH**
APPLIANCE MAY BE
INSTALLED OFF OF FLOOR***
►
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
E. Hearth Extension
WARNING! Risk of Fire! Hearth extension required
to protect combustible oors in front of appliance.
WARNING! Risk of Fire! DO NOT block ventilation
slots. A minimum 1/4 in. space between the bottom of
hearth refractory and top of eld installed hearth exten-
sion (marble, tile, granite, etc) is required across full width
of replace.
If the appliance is to be placed directly on the oor, the
non-combustible hearth material will be limited to 3/4 in.
thick, including the oor adhesive. If the hearth mate-
rial will exceed 3/4 in. thick, the appliance will need to
be shimmed from the oor appropriately to maintain 1/4
in. minimum space between the oor hearth and hearth
refractory.
The base of the replace may sit on a combustible sur-
face. The area in front of the replace must be protected
by a noncombustible hearth extension, unless the re-
place is raised a minimum of three inches above the com-
bustible oor or hearth. See Figures 3.8 and 3.9.
Figure 3.9 Non-Combustible Zone
Figure 3.8 Fireplace Positioned on Combustible Surface
16 in.
(406 mm)
3-1/2 in.
(89 mm)
27-3/4 in.
(705 mm)
24 in.
(610 mm)
6 in.
(152 mm)
66-1/4 in.
(1683 mm)
WOOD OR OTHER
COMBUSTIBLE FLOOR
OR PLATFORM
MARBLE, GRANITE, TILE OR
OTHER NON-COMBUSTIBLE
HEARTH EXTENSION
3/4 in. MAX
8 in.
BOTTOM OF
FIREPLACE
NON-COMBUSTIBLE
MATERIAL ON SIDES
(PROFILE VIEW)
MINIMUM
1/4 in. SPACE
REQUIRED
• No combustibles in the area between the
two walls.
• If using 2” x 6” exterior framing material,
interior framing must be placed on edge in
order to maintain 16 in. clearance.
NOTE:
Combustible materials are not allowed in gray area.
14
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
A. Vent Termination Minimum Clearances
Roof Pitch H (Min.) Ft.
Flat to 6/12...........................................................1.0*
Over 6/12 to 7/12 .................................................1.25*
Over 7/12 to 8/12 .................................................1.5*
Over 8/12 to 9/12 .................................................2.0*
Over 9/12 to 10/12 ...............................................2.5*
Over 10/12 to 11/12 .............................................3.25
Over 11/12 to 12/12 .............................................4.0
Over 12/12 to 14/12 .............................................5.0
Over 14/12 to 16/12 .............................................6.0
Over 16/12 to 18/12 .............................................7.0
Over 18/12 to 20/12 .............................................7.5
Over 20/12 to 21/12 .............................................8.0
Figure 4.1 Minimum Height From Roof to Lowest Discharge
Opening
HORIZONTAL
OVERHANG
VERTICAL
WALL
GAS DIRECT VENT
TERMINATION CAP
12
X
ROOF PITCH
IS X/ 12
LOWEST
DISCHARGE
OPENING
2 ft.
MIN.
20 in. MIN.
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
4 4
Termination Location and Vent Information
Fire Risk.
Maintain vent clearance to combustibles as
specied.
• DO NOT pack air space with insulation or other
materials.
Failure to keep insulation or other materials away
from vent pipe could cause overheating and re.
WARNING
Figure 4.2 Staggered Termination Caps
Gas, Wood or Fuel Oil
Termination Cap
B
Gas
Termination
Cap **
A *
*
If using decorative cap cover(s), this distance may need to be
increased. Refer to the installation instructions supplied with the
decorative cap cover.
**
A B
6 in. (minimum) up to 20 in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
In a staggered installation with both gas and wood or fuel oil
terminations, the wood or fuel oil termination cap must be
higher than the gas termination cap.
* H minimum may vary depending on regional snowfall.
Refer to local codes.
15
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Figure 4.3 Minimum Clearances for Termination
X
= AIR SUPPLY INLET
A = 12 inches.................clearances above grade, veranda,
porch, deck or balcony
B = 12 inches. ................clearance to window or door that may
be opened, or to permanently closed
window
C = 18 inches .................clearance below unventilated soft
18 inches.................clearance below ventilated soft
30 inches ................clearance below vinyl soffits and
electrical service
D = 6 inches...................clearance to outside corner
E = 6 inches...................clearance to inside corner
F = 3 ft. (Canada) ..........not to be installed above a gas me-
ter/regulator assembly within 3 feet
horizontally from the center-line of the
regulator
G = 3 ft ...........................clearance to gas service regulator
vent outlet
H = 12 inches.................clearance to non-mechanical (unpow-
ered) air supply inlet, combustion air
inlet or direct-vent termination
i = 3 ft. (U.S.A.)
6 ft. (Canada) ...........clearance to a mechanical (powered)
air supply inlet
All mechanical air intakes within 10 feet of a termination cap
must be a minimum of 3 feet below termination.
J = 7 ft. ......................... On public property: clearance above
paved sidewalk or a paved driveway.
A vent shall not terminate directly above a sidewalk or paved
driveway which is located between two single family dwellings
and serves both dwellings.
V
= VENT TERMINAL
= AREA WHERE TERMINAL IS NOT PERMITTED
C
J
B
D
B
F
B
A
E
V
V
V
V
V
V
M
H or i
V
G
X
V
H
A
V
V
H
Electrical
Service
V
K
V
K
V
L
C
V
Measure horizontal clearances from this surface.
Measure vertical clearances from this surface.
CLEARANCE = 6 IN.
CAUTION! Risk of Burns! Termination caps are HOT,
consider proximity to doors, trafc areas or where people
may pass or gather (sidewalk, deck, patio, etc.). Listed cap
shields available. Contact your dealer.
• Local codes or regulations may require different
clearances.
• Vent system termination is NOT permitted in screened
porches.
• Vent system termination is permitted in porch areas with
two or more sides open.
• Hearth & Home Technologies assumes no responsibility
for the improper performance of the appliance when the
venting system does not meet these requirements.
• Vinyl protection kits are suggested for use with vinyl siding.
M = 12 inches .................. clearance under veranda, porch, deck,
balcony or overhang
Permitted when veranda, porch, deck or balcony is fully open
on a minimum of 2 sides beneath the oor.
K = 6 inches................. clearance from sides of electrical
service
L = 12 inches................ clearance above electrical service
Location of the vent termination must not interfere with access to the
electrical service.
B. Chimney Diagram
16
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
C. Approved Pipe
This appliance is approved for use with Hearth & Home
Technologies DVP venting systems. SLP venting may
be used when a power vent is installed. Refer to Section
11.A for vent component information and dimensions.
DO NOT mix pipe, ttings or joining methods from differ-
ent manufacturers.
The pipe is tested to be run inside an enclosed wall.
There is no requirement for inspection openings at each
joint within the wall.
WARNING! Risk of Fire or Asphyxiation. This appli-
ance requires a separate vent. DO NOT vent to a pipe
serving a separate solid fuel burning appliance.
How to Use the Vent Graph
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the
relationship between the vertical and horizontal dimen-
sions of the vent system.
1. Determine the height of the center of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph below, locate
the point intersecting with the slanted graph line.
2. From the point of this intersection, draw a vertical line
to the bottom of the graph.
3. Select the indicated dimension, and position the
replace in accorance with same.
Example: If the vertical dimension from the oor of
the replace is 11' (3.4 m) the horizontal run to the
face of the outer wall must not exceed 16' (4.9 m).
Sidewall Vent Graph showing the relationship between
vertical and horizonal dimensions for the Direct Vent ue
system.
Figure 4.4 Rear Wall Venting Graph (No Horizontal Elbows)
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
2 4 6 8 10 12 14 16 18 20
eg: A
Dimensions in Feet
Vertical Dimension From the Floor of Unit to the
Center of the Horizontal Vent Pipe
Horizontal dimension from the finished outside
wall to the center of the pipe on the fireplace.
17
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
D. Use of Elbows
WARNING! Risk of Fire. This appliance requires a mini-
mum of 24 inches of vertical venting before attaching any
elbow to the appliance. DO NOT attach elbow directly to
the appliance.
Diagonal runs have both vertical and horizontal vent as-
pects when calculating the effects. Use the rise for the
vertical aspect and the run for the horizontal aspect. See
Figure 4.5.
Two 45º elbows may be used in place of one 90º elbow.
On 45º runs, one foot of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run. A
length of straight pipe is allowed between two 45º elbows.
See Figure 4.5.
Figure 4.6 shows the vertical and horizontal offsets for
DVP elbows.
Figure 4.5
HORIZONTAL
VERTICAL
RUN
RISE
EFFECTIVE
LENGTH
DVP
Pipe
Effective Length Rise/Run
Inches Millimeters Inches Millimeters
DVP4 4 102 2-3/4 70
DVP6 6 152 4-1/4 108
DVP12 12 305 8-1/2 216
DVP24 24 610 17 432
DVP36 36 914 25-1/2 648
DVP48 48 1219 34 864
DVP6A 3 to 6 76 to 152
2-1/8-4-1/4 54-108
DVP12A 3 to 12 76 to 305
2-1/8-8-1/2 54-216
Y
X
X
X
Vent Type
X
Inches Millimeters
DVP 16-1/4 413
Figure 4.6 Vertical and Horizontal Offset for DVP and SLP Elbows
Vent
Type
X Y
Inches Millimeters Inches Millimeters
DVP 6-5/8 168 16-1/2 419
18
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
E. Measuring Standards
Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards:
• Pipe measurements are shown using the effective length
of pipe. See Section 11.A Figure 11.1 for information on
effective length of pipe components.
• Horizontal terminations are measured to the outside
mounting surface (ange of termination cap) (see Figure
4.7).
• Vertical terminations are measured to top of last section
of pipe. See Figure 4.8.
• Horizontal pipe installed level with no rise.
MEASURE TO SHADED SURFACE
(OUTSIDE MOUNTING SURFACE)
Figure 4.7 Measure to Outside Mounting Surface
Figure 4.8. Measure to Top of Last Section of Pipe
General Rules:
• SUBTRACT 3 ft. from the total H measurement for each
90º elbow installed horizontally.
• SUBTRACT 1-1/2 ft. from the total H measurement for
each 45º elbow installed horizontally.
• A maximum of three 90º elbows (or six 45º elbows) may
be used in any vent conguration. Some elbows may be
installed horizontally.
• Elbows may be placed back to back anywhere in the
system.
• Any 90º elbow may be replaced with two back to back
45º elbows.
• When penetrating a combustible wall, a wall shield
restop must be installed.
• When penetrating a combustible ceiling, a ceiling restop
must be installed.
• This appliance requires a minimum of 24 inches of verti-
cal pipe attached directly to the appliance starting collar
before attaching a 90 degree or 45 degree elbow.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released.
F. Vent Diagrams
19
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Read all instructions completely and thoroughly
before attemping installation. Falilure to do so
could result in serious injury, property damage
or loss of life. Operation of improperly installed
and maintained venting system could result in
serious injury, property damage or loss of life.
WARNING
A. Installation Precautions
Consult local building codes before beginning the instal-
lation. The installer must make sure to select the proper
vent system for installation. Before installing vent kit,
the installer must read this replace manual and vent kit
instructions.
Only a qualied installer/service person should install the
venting system. The installer must follow these safety
rules:
• Wear gloves and safety glass for protection.
• Use extreme caution when using ladders or when on
rooftops.
• Be aware of electrical wiring locations in walls and
ceilings.
The following actions will void the warranty on your
venting system:
• Installation of any damaged venting component.
• Unauthorized modication of the venting system.
• Installation of any component part not manufactured or
approved by Hearth & Home Technologies.
• Installation other than permitted by these instructions.
Horizontal sections of this vent system require
a minimum of 3" clearances to combustibles at
the top of the ue and 1" clearance at the sides
and bottom until the ue penetrates the outside
wall. A minimum 1" clearance all around the ue
is acceptable at this point of penetration. Unless
the vertical run is 7-1/2 feet or higher from the
oor of the replace, the clearance for horizontal
run is 1" on all sides.
Vertical sections of this vent system require a
minimum of 2" clearance to combustibles at
the top of the unit directly above the stand-off.
A minimum of 1" clearance all aroun the ue is
acceptable thereafter.
WARNING
NOTICE: Failure to follow these instructions will
void the warranty.
*3 in.
**1 in.
**1 in.
FP2567
KSTDV vent clearances
24 in.
(610 mm)
72 in.
(1829 mm)
Figure 5.1 Combustible Clearances for Vent Pipe
* A minimum of 3" clearance to the top is required along
horizontal length until ue pipe penetrates outside wall.
** A minimum 1" clearance to combustibles permitted all
around ue at outside wall
FP2567
WARNING
This replace must be vented to the outside.
The venting system must NEVER be attached to
a chimney serving a separate solid fuel burning
appliance. Each gas appliance must use a
separate vent system. Do not use common vent
systems.
5 5
Venting Installation
20
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Installation Planning
There are two basic types of direct-vent installation:
• Horizontal Termination
• Vertical Termination
It is important to select the proper length of vent pipe for
the type of termination you choose. It is also important to
note the wall thickness.
For Horizontal Termination
Select the amount of vertical rise desired. All horizontal run
of venting must have 1/4" rise for every 12" of run towards
the termination below 7
1
⁄2" of vertical rise from oor of re-
place. With 7
1
⁄2 feet or more of vertical rise from the oor
of the replace, the horizontal run may be level. NEVER
run vent piping down.
You may use up to three 90° elbows in this vent congura-
tion. Refer to Vertical/Horizontal Termination Congurations
on Page 20.
For Vertical Termination
Measure the distance from the replace oor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufcient vent height above
the roof line.
NOTE: You may use two 45° elbows in place of a 90°
elbow. You must follow rise to run ratios when using
45° elbows. The appliance is approved for use with
three 90° elbows maximum or a combination of 90°
and 45° elbows up to a maximum of 270°.
NOTICE: When installing in a chase, you should
insulate the chase as you would the outside walls
of your home. This is especially important in
cold climates. Insulation should be considered a
combustible material. Maintain proper clearances
to all combustible materials.
NOTICE: Treatment of restops and construction of
the chase may vary from building type to building
type. These instructions are not substitutes for the
requirements of local building codes. You must follow
all local building codes.
Never run the vent pipe down. This may cause
excessive temperatures which could cause
a re.
For two-story applications, restops are required at each
oor level. If an offset is needed in the attic, additional pipe
and elbows will be required.
You may use a chase with a vent termination with exposed
pipe on the exterior of the house. See Installing Vent
System in a Chase below. If pipe is enclosed in chase, it
is not exposed.
It is very important that the venting system maintain its bal-
ance between the combustion air intake and the ue gas
exhaust. Certain limitations apply to vent congurations
and must be strictly followed.
C. Installation Instructions
Installing a Vent System in an Outside
Chase
A chase is a vertical boxlike structure built to enclose
venting that runs along the outside of a building. A chase
is required for such venting.
WARNING
Always maintain minimum clearances around
vent systems. The minimum clearances to
combustibles for horizontal vent pipe are 3”
at the top* and 1” at the sides and bottom
of the vent system until the pipe penetrates
the nearest vertical wall (1” required). A 1”
minimum clearance all around the pipe must be
maintained at outside wall and on vertical runs.
Do not pack the open air spaces with insulation
or other materials. This could cause high
temperatures and may present a re hazard.
*Unless the vertical run is 7
1
⁄2 feet or higher
from oor of replace, the clearance for the
horizontal run is 1” on all sides.
WARNING
21
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Vertical Sidewall Installation
NOTE: Sealant is not required to assemble replace
venting. Do not use silicone sealant at the inner ue
exhaust connections.
Step 1
Locate vent opening on the wall. It may be necessary to
rst position the replace and measure to obtain hole lo-
cation. Depending on whether the wall is combustible or
noncombustible, cut opening to size. See Figure 5.2 (For
combustible walls rst frame in opening.)
Combustible Walls: Cut a 10
1
⁄2”H x 10
1
⁄2”W (267 x 267
mm) hole through the exterior wall and frame as shown.
See Figure 5.2.
Noncombustible Walls: Hole opening must be 8
1
⁄2” (216
mm) in diameter.
Figure 5.4
Horizontal Length
Requirement
Noncombustible Walls: Hole opening must be 8
1
⁄2” (216
mm) in diameter.
Step 2
Secure restop to the inside frame, center in the 10
1
⁄2” x
10
1
⁄2” vent opening.
Step 3
Place replace into position. Measure the vertical height
(X) required from the base of the ue collars to the center
of the wall opening. See Figure 5.3.
Step 4
Using appropriate length of pipe section(s) attach to re-
place with three (3) screws. Follow with the installation of
the elbow.
Step 5
Measure the horizontal length requirement guring a 1
1
⁄4”
(32 mm) overlap, i.e. from the elbow to the outside wall
cap. See Figure 5.4
X
X
X
X
FP1385
VO584-100
Vent Opening
2/99 djt
10
1
⁄2”
(267 mm)
Min.
Fireplace Hearth
Opening for Noncombustible Wall
8
1
⁄2"
(216 mm)
Fireplace Hearth
Figure 5.2 Locate vent opening on wall
10
1
⁄2"
(267 mm) Min.
Vent Opening for Combustible Walls
Framing Detail
Note: Always install horizontal venting on a level
plane.
Step 6
Use appropriate length of pipe sections - telescopic or
xed - and install.
Sealing vent pipe and restop gaps with high tem-
perature sealant will restrict cold air being drawn in
around replace.
Step 7
Guide the vent terminations 5” and 8” collard into their
respective vent pipes. Double check that the vent pipes
overlap the collars by a minimum of 1
1
⁄4” (32 mm). Secure
the termination to the wall with screws provided and caulk
around the wall plate to weatherproof. As an alternative to
screwing the termination directly to the wall, you may also
use expanding plugs or an approved exterior construction
adhesive.
Note: Support horizontal pipes every 36” (914 mm)
with metal pipe straps.
Figure 5.3
Vertical Height
Requirement
22
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Vertical/Horizontal Termination
congurations
Since it is very important that the venting system maintain
its balance between the combustion air intake and the ue
gas exhaust, certain limitations as to vent congurations
apply and must be strictly adhered to.
The Vent Graph, showing the relationship between vertical
and horizontal side wall venting, will help to determine the
various dimensions allowable. See Figure 4.4.
NOTE: Horizontal sections of this vent system require
a minimum of 3" clearances to combustibles at the top
of the ue and 1" clearance at the sides and bottom
until the ue penetrates the outside wall. A minimum
1" clearance all around the ue is acceptable at this
point of penetration. Unless the vertical run is 7
1
⁄2 feet
or higher from oor of replace, the clearance for the
horizontal run is 1" on all sides.
Vertical sections of this vent system require a minimum
of 1" clearance to combustibles on all sides of the pipe.
When vent exits through foundations less than 20" below
outcrop, the termination must be ush up with outcropped
wall above.
It is best to locate the replace in such a way that minimizes
the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the ue collar of the replace (or the top of the
Transition Elbow) to the face of the nished outside wall.
• The maximum number of 90° elbows per side wall
installation is three (3). See Figure 5.5.
Figure 5.5 Maximum Three (3) 90° Elbows Per Installation
3 x 90° Elbows
24" Min.
FP1380
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Refer to Figure 5.7. This does not apply if the
90° elbows are used to increase or redirect a vertical
rise.
Example: According to the vent graph (page 14) the maxi-
mum horizontal vent length in a system with a 10' vertical
rise is 17
1
⁄2’ (5.3 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 14
1
⁄2' (4.4 m).
In Figure 5.7 dimension A plus B must not be greater than
14
1
⁄2' (4.4 m).
A
B
10 ft.
FP2546
Horizontal run
reduction
Figure 5.7 Horizontal Run Reduction
FP2546
• A minimum of 24" is required before a 90° elbow. If a 90°
elbow is tted directly after 24" vertical section mounted
to the top of the replace, the maximum horizontal vent
run before the termination is 36” (914 mm). See Figure
5.6.
Max. 20"
(508mm)
36"
(914mm)
FP1381
Figure 5.6 Horizontal Run with Minimum Vertical Rise
*NOTE: With a 24"
rise, the maximum
horizontal run is 36".
24"
(610 mm)
Min.
90° Elbow = 36" (914 mm)
Reduction
23
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
1
2
3
4
1
2
3
4
FP1383
Max bends
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 5.8 Maximum Elbow Usage
24" (610 mm)
Minimum
FP1383
supplied). Rell hole with 12" of coarse gravel leaving
a clearance of approximately 4" below snorkel. See
Figure 5.9.
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 5" and 8" snorkel collars.
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4" clearance below
snorkel. See Figure 5.9.
Figure 5.9 Below Grade Installation
FP2134
below grade install
Screws
Minimum
4" Clearance
Ground
Window
Well
Gravel
Drain
Foundation
Wall
Firestop
24"
(610 mm)
Minimum
• For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18"
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
• The maximum number of elbow degrees in a system is
270°. See Figure 5.8.
Below Grade Installations
When it is not possible to meet the required vent terminal
clearances of 12" above grade level, a snorkel kit is recom-
mended. It allows installation depth down to 7" (178 mm)
below grade level. The 7" (178 mm) is measured from the
center of the horizontal vent pipe as it penetrates through
the wall.
Ensure that sidewall venting clearances are observed.
If venting system is installed below ground, we recom-
mend a window well with adequate and proper drainage
to be installed around the termination area.
If installing a snorkel, a minimum 24" vertical rise is neces-
sary. The maximum horizontal run with the 24” vertical pipe
is 36". This measurement is taken from the collar of the
replace (or transition elbow) to the face of the exterior wall.
See the Sidewall Venting Graph for extended horizontal
run if the vertical exceeds 24".
1. Establish vent hole through the wall.
2. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel. Fasten
brackets to wall rst, then secure to snorkel with self drill-
ing #8 x 1/2 sheet metal screws. It will be necessary to
extend vent pipes out as far as the protruding wall face.
See Figure 5.10.
Figure 5.10 Snorkel Installation, Recessed Foundation
FP1966
snorkel
Foundation
Recess
Watertight Seal
Around Pipe
Sheet Metal
Screws
Wall Screws
Snorkel
24
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
• Do not back ll around snorkel.
• A clearance of at least 4" must be
maintained between the snorkel and the
soil.
Install restrictor disc as shown in Figure 20 for vertically
vented applications. Up to two (2) restrictor discs may be
needed for 40' installation. The two (2) restrictor discs
suppled will work for most installations. If a third disc is
needed order part number 56D3027.
Vertical Through-the-Roof Applications
NOTICE: A restrictor disc must be installed on
vertical terminations that are higher than 12' (366
cm).
FP2707
restrictor disc
Restrictor Disc
Fireplace Collar
Figure 5.11 Install Restrictor Disc into Fireplace Collar
This gas replace has been approved for vertical installa-
tions up to 40' (12 m) in height. Up to a 20' (6 m) horizontal
vent run can be installed within the vent system using a
maximum of two 90° elbows. See Figure 5.12.
NOTE: Horizontal sections of this vent system require a
minimum of 3" clearances to combustibles at the top of
the ue and 1" clearance at the sides and bottom until the
ue penetrates the outside wall. A minimum 1" clearance
all around the ue is acceptable at this point of penetration.
Unless the vertical run is 7
1
⁄2 feet or higher form oor of
replace, the clearance for the horizontal run is 1" on all
sides.
Vertical sections of this vent system require a minimum
of 1" clearance to combustibles on all sides of the pipe.
• Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by 18"
(457 mm).
B
A
40' (12 m) Maximum Height
12' (3.7 m) Minimum Height
Support Straps
Every 3'
FP1387a
Figure 5.12 Allowable Horizontal Runs with Vertical Rises
and Terminations
10 12 14 16 18 20
5
6
7
8
9
10
11
FP2917
vert horiz vent graph
A: Vertical
dimension from
the oor to the
center of the
horizontal vent
pipe.
B: Length of horizontal pipe section
before vertical elbow.
(Dimensions in feet)
Example: If the vertical dimension from the oor of the
replace is 8
1
⁄2' (2.6 m), the horizontal run to vertical
elbow must not exceed 16' (4.9 m).
Example: Maximum horizontal length
No elbows = 10’ (3 m)
1x45° elbows = 8.5’ (2.6 m)
2x45° elbows = 7’ (2.1 m)
• A minimum of an 8' (2.5 m) vertical rise is required.
• Two sets of 45°elbows offsets may be used within the
vertical sections. From 0 to a maximum of 8' (2.5 m)
of vent pipe can be used between elbows. See Figure
5.13.
• The maximum angular variation allowed in the system
is 270°. See Figure 5.13.
• For the minimum height of the vent above the highest
point of penetration through the roof refer to Page 24,
Figure 5.17.
WARNING
25
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
1
2
3
4
1
2
3
4
FP1179
max bends
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
24" (610 mm) Min.
Figure 5.13 Maximum Elbow Usage
Installation for Vertical Termination
1. Determine the route your vertical venting will take. If
ceiling joist, roof rafters or other framing will obstruct
the venting system, consider an offset. See Figure 5.15
to avoid cutting load bearing members.
Figure 5.14 Offset with Wall Strap and 45° Elbows
FP1969
offset w/ wallstrap
Roof Flashing
Wall Strap
45° Elbows
Ceiling Firestop
FP1669
For optimal ame appearance, a restrictor disk is necessary
on straight vertical runs of 10' of more.
• Runs may not incorporate elbows.
• The disk is part number 56D3027K and is included
in installation manual packet.
• Drop the disk into a 5" inner collar before installing the
rst section of ue or install at the last section before
installing the termination. Also disk can be installed
from inside the rebox into the 5" inner collar.
• An additional disk may be installed on runs of 35' or
more. Rotate disks perpendicular to each other.
NOTE: Pay special attention to these installation instructions
for required clearances (air space) to combustibles when
passing through ceilings, walls, roofs, enclosures, attic
rafters, etc. Do not pack air spaces with insulation. Also
note maximum vertical rise of the venting system and any
maximum horizontal offset limitations. Offsets must fall
within the parameters shown in Figures 5.15 and 5.16.
2. Set replace in desired location. Drop a line plumb down
from the ceiling to the position of the ue exit. Mark the
center point where the vent will penetrate the ceiling.
Drill a small locating hole a this point.
Drop a plumb line from the inside of the roof to the ceiling
locating hole in the ceiling. Mark the center point where
the vent will penetrate the roof. Drill a small locating hole
at this point.
Flat Ceiling Installation
1. Cut a 10
1
⁄2" (241 mm) square hole in the ceiling using
the locating hole as a center point The opening should
be framed to 10
1
⁄2"x10
1
⁄2" (267 x 267 mm) inside dimen-
sions as shown in Figure 5.16 using framing lumber
the same size as the ceiling joist. If the area above the
ceiling is an insulated ceiling or a room, nail restop
from the top side. This prevents loose insulation from
falling into the required clearance space. See Figure
5.14. Otherwise, install restop below the framed hole.
See Figure 5.16
Figure 5.15 If Area Above is a Room, Install Firestop
above Framed Hole as Shown
FP1969
firestop w room above
Firestop
Nails
26
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
2. Assemble the desired lengths of pipe and elbows nec-
essary to reach from the burner system ue up through
the restop. Be sure pipe and elbow connections are
fully twist-locked.
3. Cut a hole in the roof using the locating hole as a center
point. (Cover any exposed open vent pipes before
cutting hole in roof). The 10
1
⁄2"x10
1
⁄2" (267 x 267 mm)
hole must be measured on the horizontal. Actual length
may be larger depending on the pitch of the roof. There
must be a 1" minimum clearance from the vent pipe to
combustible materials. (Insulation should be considered
a combustible material).
4. Connect a section of pipe and extend up through the
hole.
NOTE: If an offset is needed to avoid obstructions, you
must support the vent pipe every three (3) feet. Use wall
straps for this purpose. Page 22, Figure 5.12. Whenever
possible, use 45° elbows instead of 90° elbows. The 45°
elbow offers less restriction to the ow of the ue gases
and intake air.
5. Place the ashing over the pipe section(s) extending
through the roof. Secure the base of the ashing to
the roof and framing with roong nails. Be sure roong
material overlaps the top edge of the ashing. There
must be a 1" clearance from the vent pipe to combustible
materials.
6. Continue to add pipe sections until the height of the vent
cap meets the minimum building code requirements as
shown in Figure 5.17.
NOTE: You must increase vent height for steep roof
pitches. Nearby trees, adjoining roof lines, steep pitched
roofs, and other similar factors may cause poor draft or
down-drafting in high winds. Increasing the vent height
may solve this problem.
NOTE: If the vent pipe passes through any occupied areas
above the rst oor, including storage spaces and closets,
you must enclose pipe. You may frame and sheetrock the
enclosure with standard construction material. Make sure
to meet the minimum allowable clearances to combustibles.
Do not ll any of the required clearance spaces with
insulation.
Termination Height for Vents above Flat or
Sloped Roofs.
Figure 5.16 If Area Above is Not a Room, Install Firestop
above Framed Hole as Shown
10
1
/
2
"
10
1
/
2
"
FP1970
firestop no room
Nails
Firestop
FP1970
2 ft.
Min.
2 ft. Min.
X
12
H*
FP1971
Min chimney clearance
Horizontal Overhang
Termination
Vent
Lowest
Discharge
Opening
Storm Collar
Flashing
Concentric
Vent Pipe
1" Minimum
Clearances to
Combustibles
Vertical Wall
FP1971
Figure 5.17 Minimum Chimney Clearance
Roof Pitch H (feet)
Flat to 6/12 1.0
Over 6/12 to 7/12 1.25
Over 7/12 to 8/12 1.5
Over 8/12 to 9/12 2.0
Over 9/12 to 10/12 2.5
Over 10/12 to 11/12 3.25
Over 11/12 to 12/12 4.0
*H - Minimum height from roof to
lowest discharge opening of vent
27
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
6 6
Appliance Preparation
A. Securing and Leveling the Appliance
WARNING! Risk of Fire! Prevent contact with:
• Sagging or loose insulation
• Insulation backing or plastic
• Framing and other combustible materials
Block openings into the chase to prevent entry of blown-
in insulation. Make sure insulation and other materials
are secured.
DO NOT notch the framing around the appliance
standoffs.
Failure to maintain air space clearance may cause
overheating and re.
The diagram shows how to properly position and secure
the appliance. See Figure 6.1. Nailing tabs are provided
to secure the appliance to the framing members.
• Bend out nailing tabs on each side.
• Place the appliance into position.
• Keep nailing tabs ush with the framing.
• Level the appliance from side to side and front to back.
• Shim the appliance as necessary. It is acceptable to use
wood shims underneath the appliance.
• Secure the appliance to the framing by using nails or
screws through the nailing tabs.
• Secure the appliance to the oor by inserting two screws
through the pilot holes at the bottom of the appliance.
• Optional: Secure the appliance to the oor by inserting
two screws through the pilot holes at the bottom of the
appliance.
Figure 6.1 Proper positioning, leveling and securing of an
appliance
28
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
7 7
Venting and Chimneys
A. Assemble Vent Sections
(DVP Pipe Only)
Attach Vent to the Firebox Assembly
Note: The end of the pipe sections with the lanced tabs
will face toward the appliance.
Attach the rst pipe section to the starting collar:
• Lanced pipe end of the starting collar.
• Inner pipe over inner collar.
• Push the pipe section until all lanced tabs snap in place.
• Lightly tug on pipe to conrm it has locked.
Figure 7.2
A
B
Figure 7.3
Assemble Pipe Sections
Per Figure 7.2:
• Start the inner pipe on the lanced end of section A into
the ared end of section B.
• Start the outer pipe of section A over the outer pipe of
section B.
• Once both vents sections are started, push rmly until
all lanced tabs lock into place.
• Lightly tug on the pipe to conrm the tabs have locked.
It is acceptable to use screws no longer than 1/2 in. (13
mm) to hold outer pipe sections together. If predrilling holes,
DO NOT penetrate inner pipe.
For 90º and 45º elbows that are changing the vent direction
Required Commercial, Multi-family (Multi-level exceeding
two stories), or High-Rise Applications
All outer pipe joints must be sealed with 100% silicone
(300ºF minimum continuous exposure rating), including
the slip section that connects directly to the horizontal ter-
mination cap.
• Apply a bead of silicone sealant (300ºF minimum con-
tinuous exposure rating) inside the female outer pipe
joint prior to joining sections. See Figure 7.1. OR
Apply a bead of silicone sealant (300ºF minimum con-
tinuous exposure rating) to the outside of connecting
joint after joining sections OR
Apply aluminum foil tape (300ºF minimum continuous
exposure rating) to the outside of connecting joint after
joining sections. On horizontal pipe runs, it is recom-
mended that the tape seam is positioned on the bottom
side of the vent pipe.
• Only outer pipes need to be sealed. All unit collar, pipe,
slip section, elbow and cap outer ues shall be sealed
in this manner, unless otherwise stated.
WARNING! Risk of Fire or Explosion! DO NOT break
silicone seals on slip sections. Use care when remov-
ing termination cap from slip pipe. If slip section seals
are broken during removal of the termination cap, vent
could leak.
Figure 7.4 Seams
Note: Make sure that the seams are not aligned to prevent
unintentional disconnection.
INCORRECT
CORRECT
LancesLances
Figure 7.1 High Temperature Silicone Sealant
from horizontal to vertical, one screw minimum should be put
in the outer ue at the horizontal elbow joint to prevent the
elbow from rotating. Use screws no longer than 1/2 in. (13
mm). If predrilling screw holes, DO NOT penetrate inner pipe.
29
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Assemble Slip Sections
• Slide the inner ue of the slip section into the inner ue
of the pipe section and the outer ue of the slip section
over the outer ue of the pipe section. See Figure 7.5.
• Slide together to the desired length.
Figure 7.5 Slip Section Pilot Holes
Figure 7.6 Screws into Slip Section
Pilot holePilot hole
• Continue adding pipe as necessary following instructions
in “Assembling Pipe Sections.”
NOTICE: If slip section is too long, the inner and outer
ues of the slip section can be cut to the desired length.
• Maintain a 1-1/2 in. (38 mm) overlap between the slip
section and the pipe section.
• Secure the pipe and slip section with two screws no
longer than 1/2 in. (13 mm), using the pilot holes in the
slip section. See Figure 7.6.
NOTICE: When installing a vent system with an HRC
termination cap, all pipe system joints shall be sealed
using a high temperature silicone sealant (300ºF minimum
continuous exposure rating).
• Apply a bead of silicone sealant (300ºF minimum
continuous exposure rating) inside the female outer pipe
joint prior to joining sections.
• Only outer pipes are sealed, sealing the inner ue is not
required.
• All unit collar, pipe, slip section, elbow and cap outer
ues shall be sealed.
120º
Figure 7.7 Securing Vertical Pipe Sections
C. Secure the Vent Sections
• Vertical runs originating off the top of the appliance, with
no offsets, must be supported every 8 ft. (2.44 m) after
the maximum allowed 25 ft. (7.62 m) of unsupported rise.
• Vertical runs originating off the rear of the appliance, or
after any elbow, must be supported every 8 ft. (2.44 m).
• Horizontal runs must be supported every 5 feet (1.52
m).
• Vent supports or plumbers strap (spaced 120º apart)
may be used to support vent sections. See Figures 7.7
and 7.8.
• Wall shield restops may be used to provide horizontal
support to vent sections.
• SLP ceiling restops have tabs that may be used to
provide vertical support.
WARNING! Risk of Fire, Explosion or Asphyxiation!
Improper support could allow vent to sag and separate.
Use vent run supports and connect vent sections per in-
stallation instructions. DO NOT allow vent to sag below
connection point to appliance.
120º
Figure 7.8 Securing Horizontal Pipe Sections
30
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
D. Disassemble Vent Sections
• Rotate either section (see Figure 7.9) so the seams on
both pipe sections are aligned as shown in Figure 7.10.
• Pull carefully to separate the pieces of pipe.
Figure 7.10 Align and Disassemble Vent Sections
Figure 7.9 Rotate Seams for Disassembly
E. Vertical Termination Requirements
Install Metal Roof Flashing
• See minimum vent heights for various pitched roofs
(Figure 7.11) to determine the length of pipe to extend
through the roof.
• Slide the roof ashing over the pipe sections extending
through the roof as shown in Figure 7.12.
Roof Pitch H (Min.) Ft.
Flat to 6/12........................................1.0*
Over 6/12 to 7/12 ............................1.25*
Over 7/12 to 8/12 ..............................1.5*
Over 8/12 to 9/12 ..............................2.0*
Over 9/12 to 10/12 ............................2.5*
Over 10/12 to 11/12 ......................... 3.25
Over 11/12 to 12/12 ........................... 4.0
Over 12/12 to 14/12 ........................... 5.0
Over 14/12 to 16/12 ........................... 6.0
Over 16/12 to 18/12 ........................... 7.0
Over 18/12 to 20/12 ........................... 7.5
Over 20/12 to 21/12 ........................... 8.0
* H minimum may vary depending on
regional snowfall. Refer to local codes.
Figure 7.11 Minimum Height From Roof to Lowest Discharge
Opening
HORIZONTAL
OVERHANG
VERTICAL
WALL
GAS DIRECT VENT
TERMINATION CAP
12
X
ROOF PITCH
IS X/ 12
LOWEST
DISCHARGE
OPENING
2 ft.
MIN.
20 in. MIN.
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
NOTICE: Failure to properly caulk the roof ashing and
pipe seams could permit entry of water.
• Caulk the gap between the roof ashing and the outside
diameter of the pipe.
• Caulk the perimeter of the ashing where it contacts the
roof surface. See Figure 7.13.
• Caulk the overlap seam of any exposed pipe sections
that are located above the roof line.
31
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Figure 7.13 insert Bolt into Brackets
CAULK
Figure 7.12
Assemble and Install Storm Collar
CAUTION! Risk of Cuts, Abrasions or Flying Debris.
Wear protective gloves and safety glasses during instal-
lation. Sheet metal edges are sharp.
• Slide the storm collar onto the exposed pipe section
and align brackets.
• Insert a bolt (provided) through the brackets and install
nut. Do not completely tighten.
• Slide the assembled storm collar down the pipe section
until it rests on the roof ashing (see Figure 7.13).
• Tighten nut and make sure the collar is tight against the
pipe section.
• Caulk around the top of the storm collar. See Figure 7.14.
Install Vertical Termination Cap
• Attach the vertical termination cap by sliding the inner
collar of the cap into the inner ue of the pipe section
while placing the outer collar of the cap over the outer
ue of the pipe section.
• Secure the cap by driving three self-tapping screws
(supplied) through the pilot holes in the outer collar of
the cap into the outer ue of the pipe (see Figure 7.14).
Figure 7.14
32
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Install Horizontal Termination Cap
WARNING! Risk of Fire! The telescoping ue sec-
tion of the termination cap MUST be used when con-
necting vent.
• 1-1/2 (38 mm) minimum overlap of ue telescoping
section is required.
Failure to maintain overlap could cause overheating and
re.
• Vent termination must not be recessed in the wall. Siding
may be brought to the edge of the cap base.
• Flash and seal as appropriate for siding material at
outside edges of cap.
• When installing a horizontal termination cap, follow
the cap location guidelines as prescribed by current
ANSI Z223.1 and CAN/CGA-B149 installation codes
and refer to Section 4 of this manual.
CAUTION! Risk of Burns! Local codes may require in-
stallation of a cap shield to prevent anything or anyone
from touching the hot cap.
NOTICE: When penetrating a brick wall, a brick extension
kit is available for framing the brick.
Important Notice: Heat shields may not be eld constructed.
F. Horizontal Termination Requirements
Heat Shield Requirements for Horizontal
Termination
WARNING! Risk of Fire! To prevent overheating and re,
heat shields must extend through the entire wall thick-
ness.
• DO NOT remove the heat shields attached to the
wall shield restop and the horizontal termination cap
(shown in Figure 7.15).
• Heat shields must overlap 1-1/2 in. (38 mm) mini-
mum.
There are two sections of the heat shield. One section
is factory-attached to the wall shield restop. The other
section is factory-attached to the cap. See Figure 7.15.
If the wall thickness does not allow the required 1-1/2 in.
(38 mm) heat shield overlap when installed, an extended
heat shield must be used.
• If the wall thickness is less than 4 in./102 mm (DVP)
or 4-3/8 in./ 111 mm (SLP), the heat shields on the cap
and wall shield restop must be trimmed. A minimum
1-1/2 in. (38 mm) overlap MUST be maintained.
• Use an extended heat shield if the nished wall
thickness is greater than 7-1/4 in. (184 mm).
• The extended heat shield may need to be cut to length
maintaining sufcient length for a 1-1/2 in. (38 mm)
overlap between heat shields.
• Attach the extended heat shield to either of the existing
heat shields using the screws supplied with the extended
heat shield. Refer to vent components diagrams in the
back of this manual.
• Rest the small leg on the extended heat shield on top
of the pipe section to properly space it from the pipe
section.
33
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
A. General Information
WARNING! Risk of Shock or Explosion! DO NOT wire
110-120 VAC to the valve or to the appliance wall switch.
Incorrect wiring will damage controls.
NOTICE: This appliance must be electrically wired
and grounded in accordance with local codes or, in the
absence of local codes, with National Electric Code
ANSI/NFPA 70-latest edition or the Canadian Electric
Code CSA C22.1.
• Wire the appliance junction box to unswitched 110-
120 VAC. This is required for proper operation of the
appliance (Intellire ignition).
• A 110-120 VAC circuit for this product must be protected
with ground-fault circuit-interrupter protection, in
compliance with the applicable electrical codes, when
it is installed in locations such as in bathrooms or near
sinks.
• Low voltage and 110-120 VAC voltage cannot be shared
within the same wall box.
Accessories Requirements
• This appliance may be used with a wall switch, wall
mounted thermostat and/or a remote control.
Wiring for optional Hearth & Home Technologies approved
accessories should be done now to avoid reconstruction.
Follow instructions that come with those accessories.
8 8
Electrical Information
Electrical Service and Repair
WARNING! Risk of Shock! Label all wires prior to dis-
connection when servicing controls. Wiring errors could
cause improper and dangerous operation. Verify proper
operation after servicing.
WARNING! Risk of Shock! Replace damaged wire with
type 105º C rated wire. Wire must have high temperature
insulation.
Junction Box Installation
• Pull the electrical wires from outside the appliance through
the opening into the valve compartment and secure wires
with a Romex connector. See Figure 8.1.
• Make all necessary wire connections to the junction box/
receptacle and reattach the junction box/receptacle to
the outer shell.
Figure 8.1 Junction Box Detail
34
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Wiring Requirements
Intellire™ Touch Ignition System Wiring
NOTICE: Batteries should only be used as a power source
in the event of an emergency power outage. Batteries
should not be used as a primary long-term power source.
Battery polarity must be correct when installing batteries.
When using batteries as a power source, the 6-volt
transformer must be unplugged from the receptacle.
Do not store batteries in the battery pack when the
appliance is powered by the 6 volt transformer connected
to permanent electrical service.
• Wire the appliance junction box to 110-120 VAC for
proper operation of the appliance.
WARNING! Risk of Shock or Explosion! DO NOT wire
IFT controlled appliance junction box to a switched circuit.
Incorrect wiring will override IFT safety lockout.
• Refer to Figure 8.3 or 8.4, IFT Wiring Diagram.
• This appliance is equipped with an Intellire™ Touch
control valve which operates on a 6 volt/1.5 AMP system.
• Plug the 6 volt transformer plug into the appliance junction
box to supply power to the unit OR install 4 AA cell
batteries (not included) into the battery pack before use.
Figure 8.3 IFT Wiring Diagram
FLAME
SENSE
IGNITER
TO JUNCTION
BOX 110-120
VAC
RF MODULE
ADAPTER
I
S
6 PIN
RED
BLK
ORANGE
(PILOT)
GREEN
(MAIN)
IFT-RC400
REMOTE
CONTROL
RED
BLK
BRN
BRN
JUMPER WIRE
BRN
WIRE ASSEMBLY
MODULE
RESET
SWITCH
ACCESSORY CABLE
POWER VENT
(OPTIONAL)
HALOGEN
ACCENT
LIGHTS
35
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
A. Fuel Conversion
• Make sure the appliance is compatible with available gas
types.
• Conversions must be made by a qualified service
technician using Hearth & Home Technologies specied
and approved parts.
B. Gas Pressure
• Optimum appliance performance requires proper input
pressures.
• Gas line sizing requirements will be determined in ANSI
Z223.1 National Fuel Gas Code in the USA and CAN/
CGA B149 in Canada.
• Pressure requirements are:
C. Gas Connection
• Refer to Reference Section 3 for location of gas line
access in appliance.
• Gas line may be run through knockout(s) provided.
• The gap between supply piping and gas access hole
may be caulked with caulk with a minimum of 300
ºF continuous exposure rating or stuffed with non-
combustible, unfaced insulation to prevent cold air
inltration.
• Ensure that gas line does not come in contact with outer
wrap of the appliance. Follow local codes.
• Pipe incoming gas line into valve compartment.
• Connect incoming gas line to the 1/2 in. (13 mm)
connection on manual shutoff valve.
WARNING! Risk of Fire or Explosion! Support control
when attaching pipe to prevent bending gas line.
• A small amount of air will be in the gas supply lines.
WARNING! Risk of Fire or Explosion! Gas build-up
during line purge could ignite.
• Purge should be performed by qualified service
technician.
• Ensure adequate ventilation.
• Ensure there are no ignition sources such as sparks or
open ames.
Light the appliance. It will take a short time for air to purge
from lines. When purging is complete the appliance will
light and operate normally.
WARNING! Risk of Fire, Explosion or Asphyxiation!
Check all ttings and connections with a non-corrosive
commercially available leak-check solution. DO NOT use
open ame. Fittings and connections could have loos-
ened during shipping and handling.
WARNING! Risk of Fire! DO NOT change valve settings.
This valve has been preset at the factory.
WARNING! Risk of Fire or Explosion! High pressure
will damage valve. Low pressure could cause explosion.
• Verify inlet pressures. Verify minimum pressures when
other household gas appliances are operating.
• Install regulator upstream of valve if line pressure is
greater than 1/2 psig.
9 9
Gas Information
Gas Pressure Natural Gas Propane
Minimum inlet pressure 5.0 in. w.c. 11.0 in. w.c.
Maximum inlet pressure 10.0 in. w.c. 13.0 in. w.c.
Manifold pressure 3.5 in. w.c. 10.0 in. w.c.
Note: Have the gas supply line installed in accordance with
local codes, if any. If not, follow ANSI 223.1. Installation
should be done by a qualied installer approved and/or
licensed as required by the locality. (In the Commonwealth
of Massachusetts installation must be performed by a
licensed plumber or gas tter).
Note: A listed (and Commonwealth of Massachusetts ap-
proved) 1/2 in. (13 mm) T-handle manual shut-off valve
and exible gas connector are connected to the 1/2 in. (13
mm) control valve inlet.
• If substituting for these components, please consult
local codes for compliance.
Fire Risk.
Explosion Hazard.
High pressure will damage valve.
• Disconnect gas supply piping BEFORE
pressure testing gas line at test pressures
above 1/2 psig.
• Close the manual shutoff valve BEFORE
pressure testing gas line at test pressures
equal to or less than 1/2 psig.
WARNING
D. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certied without a
reduction of input rate for elevations up to 4500 feet
(1370 m)above sea level. Please consult provincial and/
or local authorities having jurisdiction for installations at
elevations above 4500 feet (1370 m).
Check with your local gas utility to determine proper
orice size.
36
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
10 10
Finishing - Final Installation
A. Facing Material
• Metal front faces may be covered with non-combustible
materials only.
• Facing and/or nishing materials must not interfere with
air ow through louvers, operation of louvers or doors,
or access for service.
• Facing and/or nishing materials must never overhang
into the glass opening.
• Observe all clearances when applying combustible
materials.
• Seal joints between the nished wall and appliance top
and sides using a 300 ºF minimum sealant. Refer to
Figure 10.1.
WARNING! Risk of Fire! DO NOT apply combustible
materials beyond the minimum clearances. Comply with
all minimum clearances to combustibles as specied in
this manual. Overlapping materials could ignite and will
interfere with proper operation of doors and louvers.
Figure 10.1 Non-combustible Facing Diagram (Indoor Side)
NOTICE: Surface temperatures around the appliance will
become warm while the appliance is in operation. Ensure
finishing materials used for all surfaces (floor, walls,
mantels, etc.) will withstand temperatures up to 190 °F.
High Temperature Sealant (300 °F / 149 °C min.)
Top and Side Seal Joint
Metal front faces and
supplied noncombusti-
ble board must be
covered with noncom-
bustible materials only.
COMBUSTIBLE MATERIAL
47.5 in.
38.6 in.
(1207 mm)
(980 mm)
Supplied non-
combustible
board
B. Installation Instructions for Outdoor Side
1. Install installation brackets and framing stand-offs.
Installation brackets can be positioned to accommo-
date the thickeness of the outer wall sheeting. Framing
stand-offs can be oirented in two (2) positions accord-
ing to the location of the replace relative to the wall
framing. See Figure 10.2.
2. Position replace in nal installation location and.
Secure the installation brackets to the wall framing.
Install electrical supply, gas supply and venting
according to installation instructions supplied with
your replace.
Figure 10.2
Sheeting can go to
Zero Clearance on
Sides of Unit
Framing Stand-off, reuse
from Original face
Adjustible
Installation Bracket
Noncombustible Material
Must Extend Above Stand-off
Height
37
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Seal this Seam
with Caulk (Both
Sides)
Seal Along Bottom
Edge with Caulk
Facing Material
Must Overlap Face
by at 3/4 in. (19 mm)
Facing Material
Must NOT Extend
Beyond This Edge
NOTE: Seal along bottom edge and boundary of facing
matieral with caulk.
Figure 10.4
NON-COMBUSTIBLE
ZONE
FLASHING
OVERLAP
FLASHING
HOUSE WRAP
OVERLAP
HOUSE WRAP
4-1/2 in.
(108 mm)
8-3/4 in. (222 mm)
3/4 in. (19 mm)
8 in. (223 mm)
3. Install facing material to overlap the face of the
replace by at least 3/4 in. (19 mm), apply high temp
weather adhesive sealant between the face of the
replace and the facing material to ensure the re-
place is sealed from the weather outside following the
parameters in Figure 10.3.
4. Install wall sheeting around the replace. Sheeting
can go to zero clearance on sides of the replace an on
top of the metal ashing.
6. Install facing material to overlap the replace by at
least 3/4 in. (19 mm), apply high temp weather adhe-
sive sealant around the perimeter of the faming mate-
rial and the replace. Also seal along the bottom edge
of the replace. See Figure 10.3
Figure 10.5
SHEETING
COMBUSTIBLE
WALL STUD
HOUSE WRAP**
(BUILDING PAPER)
OVERLAP FLASHING
4-1/4 in. (108 mm)
NON-COMBUSTIBLE
SHEETING (PROVIDED)
FIREPLACE
HEADER
RAIN FLASHING
4-1/4 in. (108 mm)
TOP OF RAIN FLASHING
TO EDGE OF HOUSE WRAP
TOP OF FIREPLACE
3-3/4 in. (95 mm)
FROM TOP OF
FIREPLACE TO
HOUSE WRAP
3/4 in. (19 mm)
OVERLAP
Figure 10.3
5. For placement of house wrap or building paper and
tape see Figure 10.4. Special care should be taken
when choosing building materialsor weatherproong
(i.e. buiding wraps, sealant tapes, liquid sealants,
rubberized ashings, etc.).All sealant materials or
building wraps installaed must be approved to a
minimum temperature of 225 °F (124 °C) continuous
exposure. Consult the material’s manufacturer to
ensure product compliance.
CAUTION: The house wrap should not come
any lower than 4-1/4 in. (6 mm) below the bend
on the metal ashing. See Figure 10.5.
38
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Top of glass frame (60 degree
ange on glass frame towards
top of rebox)
Bottom of glass frame (90
degree ange on glass frame
towared bottom of rebox)
Glass Frame Removal (Interior Side)
NOTE: You must rst remove the Safety Barrier Screen
before you remove the glass frame. To remove the bar-
rier, lift up and pull out until the tabs are clear of their
corresponding slots on the rebox. Then proceed to
remove the glass frame by:
1. Remove the plate located in front of the glass at the
bottom.
2. Rotate the access doors on the right and left side of the
glass toward the glass.
3. Remove glass frame by releasing the three latches
located at the top of the rebox. Tilt glass away from
the unit, lift glass frame up and away from the unit. See
Figure 10.6.
CAUTION
Each clamp has a quick spring force. When
reinstalling clamps, keep ngers clear.
Figure 10.6 Remove Safety Barrier and Glass Frame
GLASS FRAME
SAFETY BARRIER
DANGER
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of
burns from the hot viewing glass is provided
with this appliance and must be installed for
the protection of children and other at-risk
individuals.
39
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Top of glass frame (60 degree
ange on glass frame towards
top of rebox)
Bottom of glass frame (90
degree ange on glass frame
towared bottom of rebox)
Glass Frame Removal (Outdoor Side)
1. Remove the top trim at the top of the stainless steel
outdoor face see Figure 10.7.
2. Remove the stainless steel screen face by lifting up and
out. See Figure 10.7.
3. Remove exterior glass door assembly by unfastening
the top four machine bolts, the two side bolts and the two
bottom corner bolts. Loosen the two middle bottom bolts
but do not remove total to help support the assembly.
See Figure 10.7.
4. Lift glass frame assembly up and out.
5. Remove the stainless steel inner frame by unfastening
the two machine bolts at the bottom and the ten stainless
steel screws that secure the inner frame to the stainless
steel face. Pull the inner frame out. See Figure 10.7.
6. Remove the inner glass frame by releasing the three
latches located at the top of the rebox. Tilt glass frame
away from the unit. Lift the glas frame up and away
from the unit. See Figure 10.7.
Figure 10.7 Remove Safety Barrier and Glass Frame
TOP TRIM
STAINLESS STEEL
SCREEN
STAINLESS STEEL
OUTDOOR FACE
EXTERIOR
GLASS DOOR
STAINLESS STEEL
INNER FRAME
INNER GLASS
FRAME ASSEMBLY
DANGER
40
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
FP2592
install brick
Wall Brick
Floor Brick
Hearth Brick
Light Box Cover
Figure 10.10 Install Brick
Light Installation
1. Remove barrier screen by lifting up and out.
2. Remove glass frame assembly by unlatching the
three latches at the top of the rebox. Tilt the glass
up and out.
3. Remove the ve (5) screws securing each light box and
remove from the unit Figure
A
Figure 10.8 Light Box Removal
Lens
Lens Retainer
Bracket (26D3320K)
3. The light bulbs are included in the Homeowner's Manual
packet. Install the light bulbs into bulb sockets as shown
in Figure 10.8. CAUTION: Finger prints or the transfer
of oil from hands will reduce the lifespan of the bulbs. It
is advisable to handle the light bulbs with a clean cloth.
4. The light lenses, lens retainer brackets and screws are
included in the Homeowner’s Manual packet. Install the
light lenses into the light cover box and secure with the
lens retainer brackets and screws as shown in Figure
10.9.
Figure 10.9 Lense Retainer Bracket Removal
Light Box Cover
Brick Installation
1. It is easier to remove the grate on the outdoor side
from inside of the unit in order to be able to place the
two hearth brick in place by unfastening the two
screws that secure the grate. Replace the grate after
brick are installed.
2. Install the vour (4) hearth brick pieces, two on each
side of the unit, in front of the burners from the indoor
side.
3. Place the oor brick panels on the brick supports
between the hearth bricks.
Note: Wall bricks are different, the combustion air
side has cut out at the bottom.
4. Place the wall brick panels against the rebox walls,
setting on the oor and hearth bricks. The wall brick
will be held in place by the brick retainer tab on the
light box cover. See Figure 10.10.
5. The brick retainer tab can be bent to a different angle
to hold the wall brick panels in place more rmly if
necessary.
41
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Rock Wool Placement
Place rock wool evenly in dime-sized pieces over front
and rear burner both in front and behind rear grate. For
the middle burner, place the rock wool only on the carry-
over areas between the ames. To better enable the gas
to permeate the rock wool, apply the rock wool in light,
uffy pieces.
Do not use the entire bag of rock wool to
cover the burner. This could cause the ame
to burn poorly and may lead to sooting.
LG725
rockwool
Figure 10.11 Rockwool placement
WARNING
42
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
C. Log Placement Instructions
1. Facing the indoor side of the replace and holding log #1
in your right hand with the widest end of the log toward
you. Place the log over the pilot, making sure to locate
notches in log over the rst grate tine from right on the
far side and the rst two grate tines from the right on
the closest side of the replace.
Log #1
Log #2
2. While holding log #2 in your left hand with the wide
end of the log away from you and the at edge on the
bottom left, place the log over the left end of all three
burners, making sure to align the notches in the log with
the rst grate tine from the left on both the far side and
the closest rear grates.
Log #3
3. Hold log #3 with the fat end to the left and the narrow
end to your right. Place the log over the lug on the top
of log #2 closest to the outside making sure to align the
bump on the narrow end against the inside edge of the
Figure 10.10
second tine from the right. Position log with the inside
face of the log perpendicular to the middle burner. Slide
log to the right, there will be a slight gap between the
right end of the log and log #1 (about 3/8 inch.)
4. Holding log #4 in your right hand with the narrow end
down, place the log on the lug of log #1 that is toward
the outside. Make sure to locate the notch at the narrow
end of the log over the third grate tine from the right. The
inside edge facing you of the log should rest against log
#3.
Log #4
Figure 10.11
Figure 10.12
Figure 10.13
NOTE: LOG PLACEMENT INSTRUCTIONS ARE FROM THE INDOOR SIDE OF THE FIREPLACE.
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Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Log #7
6. Hold log #6 in your left hand with the narrow cut end of
the “Y” toward you and pointing up. Place the log on
the lug on the top of log #2 with the bottom of the log
resting securely on top of the second grate tine from
the left creating a “V” shape with log #5.
Figure 10.15
Figure 10.16
Log #5
5. Hold log # 5 in your right hand with the knots at each
end of the log facing you and the notched end on your
left, place the log on the lug on the top of log #1 with
the notch in the bottom of the log resting on the third
grate tine from the right.
Figure 10.14
7. Hold log #7 with the “Y” pointing away from you and
place the log seated rmly on the lug located on the
top of log #3. This log should be positioned 2 to 2-1/2
inches above the burner.
8. Hold log #8 with the narrow end away from you and
place on the key located on the narrow end of log #5.
Make sure to rest the narrow end of log #8 on the bracket
nearest to you on the middle burner.
Log #6
Figure 10.15
Log #8
44
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Safety Barrier Installation Instructions
DANGER
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of burns from the hot
viewing glass is provided with this appliance and shall
be installed for the protection of children and
other at risk individuals.
20306543
Tabs
(two per side)
Figure 10.17
1. Remove screen from packaging.
2. Align the four slots on the sides of the screen frame
(two top, two bottom) Figure 45 with the correspond-
ing shoulder bolts on the rebox Figure 46.
3. Slide the screen down onto the shoulder bolts until it
ts securely in place.
4. Repeat on other side.
NOTICE: It is the responsibility of the installer to ensure
the barrier is afxed to the replace at the time of instal-
lation.
CERTIFIED
SAFETY BARRIER
NOTE: A barrier designed to reduce the risk of burns
from the hot viewing glass is provided with this
appliance and shall be installed for the protection of
children and other at risk individuals. If the barrier
becomes damaged, the barrier shall be replaced with
the manufacturer's barrier for this appliance.* Any
safety screen, guard, or barrier removed for servicing
the appliance must be replaced prior to operating the
appliance.
* See parts list for model number.
WARNING: The safety screen barrier
must be installed after the glass front is
in place. It is NOT a replacement for the
glass and the unit must NOT be oper-
ated without the glass in place.
45
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
10-1/2 in.
(267 mm)
10-7/8 in.
(276 mm)
45
°
7-3/8 in.
(187 mm)
11-3/8 in.
(289 mm)
1-1/4 in. (32 mm)
9-1/4 in.
(235 mm)
13-1/4 in.
(337 mm)
1/2 in.
TYP
DVP90ST (90° Elbow)
10 in.
(254 mm)
10 in.
(254 mm)
1 in.
(25 mm)
DVP-FS (Ceiling Firestop)
DVP45 (45º Elbow)
DVP Pipe (see chart)
Effective
Height/Length
4-7/8 in.
(124 mm)
(13 mm)
10 in.
(254 mm)
1- 1/2 in.
(38 mm)
5 in.
(127 mm)
12 in.
(305 mm)
UP
DVP-HVS (Vent Support)
12 in.
(305 mm)
14 in.
(356 mm)
1 in.
(25 mm)
8 in.
(203 mm)
6 in.
(152 mm)
DVP-WS (Wall Shield Firestop)
Finished Height: 19-3/4 in./502 mm
UNIV-AS2 (Attic Insulation Shield)
Tab=1 in.
(25.4 mm)
20-3/4 in.
(527 mm)
14 IN.
(356 MM)
14 IN.
(356 MM)
20 IN.
(508 MM)
12 IN.
(305 MM)
DVP-RDS
ROOF DECK INSULATION SHIELD
11 11
Reference Materials
A. Vent Components Diagrams
Figure 11.1 DVP Vent Components
Pipe
Effective Length
Inches Millimeters
DVP4 4 102
DVP6 6 152
DVP12 12 305
DVP24 24 610
DVP36 36 914
DVP48 48 1219
DVP6A 3 to 6 76 to 152
DVP12A 3 to 12 76 to 305
46
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
DVP-TRAP1
DVP-TRAP2
DVP-TRAPK2
DVP-TRAPK1
DVP-TRAP
Horizontal Termination Cap
15-1/8 in.
(384 mm)
12 in.
(305 mm)
8 in.
(203 mm)
Max
Effective
Length
Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm). The heat shield is designed to be
used on a wall 4 in. to 7-1/4 in. (102 mm to 184 mm) thick. If wall thickness is less than 4 in. (102 mm) the
existing heat shields must be field trimmed. If wall thickness is greater than 7-1/4 in. (184 mm) a DVP-HSM-B
will be required.
Heat
Shield
A. Vent Components Diagrams (continued)
Figure 11.2 DVP Vent Components
Term Cap
Minimum
Effective Length
Maximum
Effective Length
Trap1
3-1/8 in. 4-5/8 in.
79 mm 117 mm
Trap2
5-3/8 in. 9-3/8 in.
137 mm 238 mm
47
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
13-1/4 in.
(337 mm)
24-5/8 in.
(625 mm)
27-1/2 in.
(699 mm)
RF6
Roof Flashing
31 in.
(787 mm)
24-5/8 in.
(625 mm)
13-1/4 in.
(337 mm)
RF12
Roof Flashing
Cap Shield
DRC-RADIUS
13-7/8 in.
(352 mm)
9-1/2 in.
(241 mm)
14 in.
(356 mm)
COOL-ADDM
Cap Shield
11-5/8 in.
(295 mm)
5-3/4 in.
(146 mm)
7-1/8 in.
(181 mm)
12-1/8 in.
(308 mm)
DVP-BEK2
DVP-HPC Cap Brick Extension
13-7/8 in.
(352 mm)
5 in.
(127 mm)
11-7/8 in.
(302 mm)
DVP-TRAPFL
Flashing
26 in.
660 mm
DVP-HSM-B
Extended Heat Shield
A. Vent Components Diagrams (continued)
Figure 11.3 DVP Vent Components
48
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
DVP-TB1
Basement Vent Cap
12 in.
(305 mm)
1-1/2 in.
(38 mm)
7-3/8 in.
(187 mm)
14 in.
(356 mm)
17-3/4 in.
(451 mm)
7-1/4 in.
12 in.
305 mm
(184 mm)
5-1/4 in.
(133 mm)
12-1/2 in.
(318 mm)
DVP-TVHW
VerticalTermination Cap (Highwind)
14 in.
(356 mm)
12 in.
(305 mm)
16-7/8 in.
(429 mm)
6 in.
152 mm
A. Vent Components Diagrams (continued)
Figure 11.4 DVP Vent Components
49
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
A. Vent Components Diagrams (continued)
Figure 11.5 Vent Components
Optional Wire Harness
DESCRIPTION PART NUMBER
10 FT PV Wire Harness PVI-WH10
20 FT PV Wire Harness PVI-WH20
40 FT PV Wire Harness PVI-WH40
60 FT PV Wire Harness PVI-WH60
80 FT PV Wire Harness PVI-WH80
100 FT PV Wire Harness PVI-WH100
PVI-SLP
Power Vent Inline
SLP-LPC
SLP Low Prole Cap
Note: Wire harnesses required to power the PVI-SLP
connect to the appliance and are ordered separately from
PVI-SLP. Contact your dealer to order.
16 IN.
406 mm
15 IN.
(381 mm)
16-11/16 IN.
(424 mm)
9-3/16 IN.
(233 mm)
4-1/2 IN.
114 mm
16-11/16 IN.
424 mm
13-5/8 IN.
(346 mm)
12-1/2 IN.
(318 mm)
12-1/2 IN.
318 mm
20-3/4 IN.
527 mm
13-5/8 IN.
346 mm
EFFECTIVE LENGTH
32 IN. (813 mm) MIN.
35 IN. (889 mm) MAX.
Note: Use only approved termination caps with the PVI-
SLP. See instructions included with PVI-SLP kit.
50
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
A. Vent Components Diagrams (continued)
Required Wire Harness
DESCRIPTION PART NUMBER
10 FT PV Wire Harness PVI-WH10
20 FT PV Wire Harness PVI-WH20
40 FT PV Wire Harness PVI-WH40
60 FT PV Wire Harness PVI-WH60
80 FT PV Wire Harness PVI-WH80
100 FT PV Wire Harness PVI-WH100
Note: Wire harnesses required to power the PVLP-SLP
connect to the appliance and are ordered separately from
PVLP-SLP. Contact your dealer to order.
Figure 11.6 PVLP-SLP Vent Components
PVLP-HS
Heat Shield
14 IN.
356 mm
15-1/2 IN.
394 mm
11-1/2 IN.
292 mm
8 IN.
203 mm
4-3/8 IN.
112 mm
10 IN.
254 mm
5-1/4 IN.
135 mm
2-1/4 IN.
57 mm
9-1/2 IN.
241 mm
4-3/4 IN.
121 mm
2-1/4 IN.
57 mm
1-1/2 IN.
38 mm
6-1/4 IN.
159 mm
Front View
Top View
Side View
Note: A PVLP-HS heat shield is available and sold
separately. Use if the PVLP-SLP is installed in a high trafc
area.
PVLP-BEK
Brick Kit
PVLP-SLP
Power Vent Low Prole
51
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
Figure 11.7 SLP Series Vent Components
8-3/4 in.
222 mm
6-1/2 in.
165 mm
6-5/8 in.
168 mm
6 in.
152 mm
6-1/2 in.
165 mm
6-5/8 in.
168 mm
9-7/8 in.
251 mm
6-1/2 in.
165 mm
9-1/4 in.
235 mm
SLP45
45° Elbow
SLP90
90° Elbow
Effective
Height/
Length
SLP PIPE
SLP-HVS
Horizontal Pipe
Support
SLP-FS
Ceiling Firestop
SLP-WS
Wall Shield Firestop
DVP-SLP24
Adapter
6-1/2 in.
165 mm
25-3/16 in.
640 mm
8-1/16 in.
205 mm
10-7/8 in.
276 mm
8-7/8 in.
225 mm
1-1/2 in.
38 mm
8-11/16 in.
220 mm
8-11/16 in.
220 mm
1-1/2 in.
38 mm
12 in.
305 mm
12 in.
305 mm
5-1/2 in.
146 mm
Effective Height/Length
Pipe
inches mm
SLP4 4 102
SLP6 6 152
SLP12 12 305
SLP24 24 610
SLP36 36 914
SLP48 48 1219
SLP6A 2 - 6 51 - 152
SLP12A 2 - 12 51 - 305
SLP-FLEX-2 24 610
SLP-FLEX-3 36 914
SLP-FLEX-5 60 1524
SLP-FLEX-10 120 3048
A. Vent Components Diagrams (continued)
Note: SLP pipe is only allowed when using Power Vent system.
52
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev M • 06/22
B. Accessories
Remote Controls, Wall Controls and Wall
Switches
Follow the instructions supplied with the control installed
to operate your replace:
For safety:
• Install a switch lock or a wall/remote control with child
protection lockout feature.
• Keep remote controls out of reach of children.
See your dealer if you have questions.
Printed in U.S.A. - Copyright 2016
Outdoor Lifestyles, a brand of Hearth & Home Technologies
7571 215
th
Street West, Lakeville, MN 55044
www.outdoorlifestylesproducts.com
Please contact your Outdoor Lifestyles dealer with any questions or concerns.
For the location of your nearest Outdoor Lifestyles dealer,
please visit www.outdoorlifestylesproducts.com
