VSL4302RC
VSL4303RC
VSL4304RC
VSL4306RC
VSL4362RC
VSL4363RC
VSL4364RC
VSL4366RC
VSL4422RC
VSL4423RC
VSL4424RC
VSL4426RC
VSL44212RC
VSL4482RC
VSL4486RC
VSL44812RC
VSL45412RC
VSL46012RC
VSL47212RC
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
28 ⅜"
28 ⅜"
28 ⅜"
28 ⅜"
34 ⅜"
34 ⅜"
34 ⅜"
34 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
46 ⅜"
46 ⅜"
46 ⅜"
52 ⅜"
58 ⅜"
70 ⅜"
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
290
390
390
600
290
390
390
600
290
390
390
600
1200
290
600
1200
1200
1200
1200
MODEL
FRONT TO
BACK
WIDTH
INTERNAL
BLOWER
CFM
PERFORMANCE · QUALITY · CUSTOMER SERVICE
REVISED: JANUARY 1, 2024
I N S T A L L A T I O N I N S T R U C T I O N S
U S E & C A R E G U I D E
V S L 4 0 0 S E R I E S
( 1 8 " M O D E L S )
Before beginning installation, please thoroughly read and
become familiar with these instructions. Installation and
service must be completed by a qualified installer. Failure
to properly install this product may void the warranty.
* * * A T T E N T I O N * * *
P L E A S E R E M O V E T H E R I G H T S I D E
B A F F L E F I L T E R T O L O C A T E Y O U R
N E W R E M O T E C O N T R O L .
Installer:
Owner:
Please leave Installation Instructions with the range hood liner.
Please keep Installation Instructions for local electrical inspector’s use and for future reference.
WARNINGS:
IMPORTANT:
TIPS:
Must be followed carefully to avoid personal injury.
Must be followed carefully to avoid damage and incorrect installation.
Contains helpful information to facilitate installation.
WARNING! TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK, OR INJURY TO PERSONS OBSERVE THE FOLLOWING:
a) Use this unit only in the manner intended by the manufacturer. If you have any questions, please contact the
manufacturer at the address or telephone number listed in the warranty.
b) Before servicing or cleaning unit, switch power off at service panel, lock service panel, and lock the service
disconnection means to prevent power from being switched on accidentally. When the service disconnecting means
cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.
CAUTION: For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
READ AND SAVE THESE INSTRUCTIONS
WARNING! TO REDUCE THE RISK OF A RANGE TOP GREASE FIRE:
a) Never leave surface units unattended at high settings. Boilovers cause smoking and greasy spillovers that may ignite.
Heat oils slowly on low or medium settings.
b) Always turn hood ON when cooking at high heat or when flambeing food (i. e. Crepes Suzette, Cherries Jubilee,
Peppercorn Beef Flambe’).
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1
CAUTION:
RECOMMENDATIONS:
To reduce the risk of fire and to properly exhaust air, be sure to duct air outside. Do not vent exhaust air
into spaces within walls, ceilings, cabinets or into attics, crawl spaces, or garages.
WARNING! TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK, OR INJURY TO PERSONS OBSERVE THE FOLLOWING:
a) Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable codes
and standards, including fire-rated construction codes and standards.
b) Sufficient air is needed for proper combustion and exhausting of gasses through the flue (chimney) of fuel burning
equipment to prevent back drafting. Follow the heating equipment manufacturer's guidelines and safety standards
such as those published by the National Fire Protection Association (NFPA) and the American Society for Heating,
Refrigeration and Air Conditioning Engineers (ASHRAE) and the local code authorities.
c) When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.
d) Ducted fans must always be vented to the outdoor.
INSTALLATION INSTRUCTIONS
WARNING! TO REDUCE THE RISK OF INJURY TO PERSONS IN THE EVENT OF A RANGE GREASE FIRE, OBSERVING THE
FOLLOWING:
Consult a licensed ventilation contractor or qualified technician for proper installation of exhaust ducting. Locate the
cooking area for minimum cross drafts-away from doors and windows, when possible.
1.
Ducts must be of adequate size and duct runs should be as short as possible. Where turns are necessary, keep
turning radius as large and as smooth as possible.
2.
The ducting must be air tight. Use a minimum of 2 sheet metal screws at every duct joint. Then, seal the duct joints
with high quality duct tape.
3.
Do not use this unit with any solid-state speed control device. 4.
This unit must be grounded. 5.
WARNING! TO REDUCE THE RISK OF FIRE, USE ONLY METAL DUCTWORK.
TO ACCESS THE INSTALLATION INSTRUCTIONS FOR YOUR TRADE-WIND® PRODUCT,
PLEASE SCAN THE QR CODE:
a) Smother flames with a close-fitting lid, cookie sheet, or metal tray, then turn off the burner. Be careful to prevent
burns. If the flames do not go out immediately, evacuate and call the fire department.
b) Never pick up a flaming pan -- you may be burned.
c) Do not use water, including wet dishcloths or towels. A violent steam explosion will result.
d) Use an extinguisher, only if:
1. You know you have a Class ABC extinguisher and you already know how to operate it.
2. The fire is small and contained in the area where it started.
3. The fire department is being called.
4. You can fight the fire with your back to an exit.
c) Clean ventilating fans frequently. Grease should not be allowed to accumulate on fan or filter.
d) Use proper pan size. Always use cookware appropriate for the size of the surface element.
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18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
18"
VSL4302RC
VSL4303RC
VSL4304RC
VSL4306RC
VSL4362RC
VSL4363RC
VSL4364RC
VSL4366RC
VSL4422RC
VSL4423RC
VSL4424RC
VSL4426RC
VSL44212RC
VSL4482RC
VSL4486RC
VSL44812RC
VSL45412RC
VSL46012RC
VSL47212RC
28 ⅜"
28 ⅜"
28 ⅜"
28 ⅜"
34 ⅜"
34 ⅜"
34 ⅜"
34 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
40 ⅜"
46 ⅜"
46 ⅜"
46 ⅜"
52 ⅜"
58 ⅜"
70 ⅜"
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
290
390
390
600
290
390
390
600
290
390
390
600
1200
290
600
1200
1200
1200
1200
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
4
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
6"
7"
3 ¼" x 10"
8"
6"
7"
3 ¼" x 10"
8"
6"
7"
3 ¼" x 10"
8"
10"
6"
8"
10"
10"
10"
10"
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
MODEL
FRONT TO
BACK
WIDTH
3-SPEED
INTERNAL
BLOWER
CFM
LED
LIGHTS
S/S BAFFLE
FLITERS
REMOTE
CONTROL
ELECTRONIC
TOUCH
CONTROL
DUCT
COLLAR
COLOR
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
S/S
290 CFM MODELS 390 CFM MODELS
1200 CFM MODELS600 CFM MODELS
IMPORTANT: CUT-OUT INFORMATION
Cabinets or hood cut-outs should be at least 1/8” larger than outside dimensions
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TILE BACKSPLASHES
For maximum ventilation performance, the bottom of the hood or liner should be 30 - 36 inches (76. 2
- 91. 4 cm) above the cooking surface (minimum is 24”). This would typically result in the bottom of
the hood being 66 - 72 inches (167. 6 - 182. 9 cm) above the floor. These dimensions provide for safe
and efficient operation of the hood. Always observe local building codes.
PART 1: PLANNING THE INSTALLATION
TRADE-WIND® Designer Series Liners are designed for installation inside custom hood canopies. Proper installation of the liner
is directly related to the material from which the custom canopy is constructed. A qualified person must complete the installation
of this unit. Because of the large size and weight of this liner, two installers are recommended. Plan the installation so that all
minimum clearances are met or exceeded. Dimensions shown provide minimum clearances, unless otherwise specified.
Important: You must provide structural framing and tight backing in the areas in which you are securing the liner inside
your custom canopy. Failure to do so could distort and damage the liner and void the warranty.
VENTILATION, DUCT SILENCERS, DAMPERS, AND DUCTING
TRADE-WIND® Duct Silencers are available from your local TRADE-WIND® dealer. When planning for installation using a
duct silencer, please refer to the Installation Instructions provided with the duct silencer.
Given that most installations are different, a back-draft damper is not provided with this unit. TRADE-WIND® back draft
dampers are also available from your local TRADE-WIND® dealer. Always install ventilation products with an approved
wall or roof cap. Duct performance is improved by using round, smooth metal duct work instead of rectangular. Do not
rely on duct tape alone to seal duct joints. Use sheet metal screws as required to support the duct.
WARNING:
PART 2: SECURING THE LINER
IMPORTANT: Liners installed immediately above the top edge of tile backsplashes thicker than 3/4” should be installed
slightly forward—not flush with the back wall. The back filter bracket of the liner is 1” deep and tile installations thicker
than this will prevent the filters from being removable.
MOUNTING HOLES
NOTE: DRILLING THROUGH STAINLESS STEEL REQUIRES A TITANIUM BIT. BE CAREFUL NOT TO DRILL THROUGH
FILTER BRACKETS, ELECTRICAL COMPONENTS OR UL LABEL. Because the TRADE-WIND® VSL Series is designed for
various wood hood applications, no mounting holes have been pre-drilled. This allows the liner to be attached in most
any area of the canopy that has a wood frame support, e. g. , the back, sides or top. We recommend at least six equally
spaced screws per liner—three screws along the back (top or back side panel) and three screws on the front top,
immediately next to the light bar wall or behind the removable light bar. Where possible, the screw holes should be
drilled into the top of the liner (instead of the sides or back). This will help prevent distorting the liner walls in situations
where the wood frame is not properly sized to the liner. Models with internal motors should also have at least one
screw centered and securely in place on each end (side panel) of the liner because of the added weight.
Neatly measure and mark (left to right and top to bottom) and drill screw holes through the liner as required to match
the wood backing. It is easier to drill holes from the outside in, by setting the liner on its face (on cardboard) and drilling
from the back side. Secure the liner by driving screws (by others) tightly into the wood frame. Use washers where
necessary.
*When removing the filters, be careful not to scratch the liner by placing the filters, screws, drill bits or drill on
the liner’s face. For visual instructions on removing the filters for mounting and other liner questions, check out
our YouTube Channel: https://www. youtube. com/channel/UCwVIbi_9hbuIATTYvz43oBA.
The VSL liner comes with a metal start collar welded in place. Attach the Start Collar to the duct with at least three equally
spaced screws. Also apply duct tape, preferably the metal type.
CONNECTING TO THE VENT PIPE
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Ensure that the power supply is disconnected before proceeding. Verify that the power supply matches the ratings found
on the appliance data label before proceeding. The complete appliance must be properly grounded at all times when
electrical power is applied. Do not ground the appliance with the neutral (white) house supply wire. A separate ground
wire must be utilized. Failure to complete electrical connections properly may result in damaged or non-functional
systems. Follow instructions carefully to ensure proper installation.
It is the owner’s responsibility to ensure that a qualified person performs the electrical connection of this appliance. The
electrical installation, including minimum supply wire size, must comply with the National Electric Code ANSI/NFPA 70-
1990 (or latest revision) and local codes and ordinances. A copy of this standard may be obtained from:
National Fire Protection Association, 1 Batterymarch Park, Quincy, Massachusetts 02269-9101
IMPORTANT: COPY THIS PAGE TO YOUR ELECTRICAL INSTALLER.
PART 3: ELECTRICAL CONNECTION
WARNING:
BLACK
WHITE
GREEN
120 VOLT AC FROM ELECTRICAL PANEL (USUALLY BLACK) TO LINER
NEUTRAL FROM ELECTRICAL PANEL (USUALLY WHITE) TO LINER
GROUND FROM ELECTRICAL PANEL (USUALLY GREEN) TO LINER
INSTRUCTIONS: A 15 to 20 amp electrical service is recommended for proper electrical supply. Before determining,
calculate amp ratings based on the product label found on the liner and the ventilator. Always observe local building
codes. Always use a dedicated circuit. Line load is calculated by adding the amperage of the halogen lights to the rated
amperage of the ventilator (either in-line or roof top). If the ventilator is rated in watts rather than amps, divide the watts
by 120 and this will give you the amperage rating. The TRADE-WIND® liner, without the internal motor, is supplied with a
6. 0 amp variable speed fan control. Make sure the rated amperage on the remote ventilator does not exceed 6. 0 amps
(or 700 watts).
CAUTION:
The neutral wire (usually white) for the blower/motor must connect to the same neutral wire that comes
from the electrical panel to the liner.
WIRING DETAILS (FOR ALL MODELS WITH INTERNAL MOTORS)
IMPORTANT: Trade-Wind Manufacturing does not pay warranty claims for damage to liners or components connected
to other brand blowers inconsistent with these Installation Instructions. Always consult the switch manufacturer's
installation instructions when substituting control switches. The warranty may be voided if any unauthorized service,
alterations or repairs are made to the product.
WIRING DIAGRAM
L I N E R
GREEN
WHITE
120V BLACK
HOUSE ELECTRICAL PANEL
DIAGRAM 1: ALL MODELS WITH
FACTORY INSTALLED INTERNAL
MOTOR/BLOWER.
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PART 4: USE AND CARE
Each filter has two aluminum cylindrical knobs, one towards the rear and one towards the front. The front & rear knobs
are only for grasping and are permanently connected to the filter. To remove the filter, grasp the front & rear knobs, pull
the filter towards the front of the hood until the back of the filter drops down. Grasping the filter, remove it from the front
by now pulling it out of the front channel. For visual instructions on how to remove the filters, visit our YouTube
Channel: https://www. youtube. com/channel/UCwVIbi_9hbuIATTYvz43oBA.
CAUTION:
The edges of the stainless steel are extremely sharp. To ensure safety, wear gloves when handling all parts.
FILTER REMOVAL:
WARNING:
Do not operate the blower/ventilator system without the filters in place, or with dirty, grease laden filters.
Always activate the ventilator when using cooking appliances. For best performance, turn on the blower a few minutes
before starting to cook to establish an airflow pattern within the room. To use the electronic touch control, touch the
button that corresponds to the desired speed. To turn off blower, touch the illuminated speed button again. The
electronic light control comes on when touched, touch again for light off.
OPERATING CONTROLS:
Eliminate air currents in the liner vicinity by shutting nearby windows and doors, turning off ceiling fans and adjusting the
adjacent heating and air conditioning outlets if necessary. Place your largest pans on the rear burners whenever possible.
Clean filters and grease laden surfaces often to improve efficiency. Always use lids on cookware to retain heat and
moisture. Minimize the amount of liquid used to cook food. Select cookware of proper size, material and construction for
the cooking task being performed.
ENERGY SAVING TIPS:
Proper cleaning is necessary to maintain performance and appearance, while also ensuring safe operation. The
frequency of cleaning should be according to the type and amount of cooking. Best results will be achieved by cleaning
soiled components as soon as possible. Filters must be cleaned regularly.
We recommend washing filters by placing them in the bottom rack of a dishwasher. Locate the holes on the sides of the
filter. Put filter in dishwasher with holes facing up, so detergent can enter filters. Dry the filters completely before using
again. Rinse and dry with a soft lint-free cloth. Always wipe stainless steel surfaces with the grain. Never wipe across the
grain. After cleaning, reinstall the filters carefully. Most common scrubber type pads will scratch the hood.
CARE AND CLEANING:
CAUTION:
If a commercially available stainless steel cleaner is used, it is important to read the labels for chlorine
compounds. Chlorine is a corrosive substance, DO NOT USE. Follow polish manufacturer’s instructions.
TRADE-WIND® liners are designed for MR16/GU10 LED light bulbs. They can be purchased at most home or grocery
stores. The bulbs provided with the unit are 120V, 5 watts, 500 lumens, and 3000K (natural warm white color
temperature). To remove the light bulbs, press your palm into the lens face of the bulb and turn a ¼ turn to the
left. The bulb should unlock from its socket, and pop out. If you need to get more leverage on the bulb, you can
purchase a suction cup with a ring on it at your local hardware store.
LED LIGHT BULBS:
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The diagram to the left shows all functions of the remote. Push the speed or light
buttons once to turn on; push the same button a second time to turn off. You can
use the “off” button to power off the lights and blower simultaneously.
The “5 minute delay auto off” button can be pressed when the blower is on at any
speed. The blue light behind the speed button will blink showing that this feature
has been activated. It will continue to blink for 5 minutes and then the blower will
shut off automatically. If you press the “5 minute delay auto off” button again the
blinking on the speed button stops and the blower has returned to manual mode.
If you would like to mount the remote to any surface near your range, Velcro pieces
have been provided. Peel and stick one piece to back of remote, and the other to
desired surface.
EXPLAINING THE REMOTE
RANGE OF REMOTE CONTROL
The infrared transmitter at the top of the remote must be pointed in the direction of the electronic control at the right front of
your hood or liner. Range distance will vary depending on your installation, but see diagram below for approximate range area.
If battery in remote needs replacing, use a CR2025 watch battery. These are very common and easy to find. To access, look
to the bottom end of the remote; push release to the right, and slide battery tray out.
SIDE VIEW: FRONT VIEW:
30"
30"
60"
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We endeavor to incorporate the best technology provided to our industry, in
manufacturing the TRADE-WIND® products, therefore, we reserve the right to
change models, mode of operation, and specification without prior notice.
PERFORMANCE · QUALITY · CUSTOMER SERVICE
W A R R A N T Y
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8 0 0 W E S T G R A N T S T R E E T
P H O E N I X , A Z 8 5 0 0 7
1 - 8 0 0 - 9 5 5 - 5 7 3 7
6 0 2 - 9 0 0 - 8 5 0 0
T - W U S A . C O M
MA D E IN PHO E NIX , AZ USA
WARRANTY REVISED: JANUARY 1, 2023
TRADE-WIND Manufacturing, LLC® has a policy of continuous improvements and
reserves the right to modify (at any time without notice) any or all of its products,
features, designs, components and specifications. For further information on
installation and wiring, see the installation instructions included with the product or
visit us on the web.
T R A D E - W I N D ® V E N T I L A T I O N P R O D U C T S
For more information, please contact your dealer or your TRADE-WIND® representative.
What IS Covered:
TRADE-WIND Manufacturing, LLC® warrants its TRADE-WIND® Ventilation Products to the original user to
be free of defects in materials and workmanship for three (3) years from the date of purchase.
TRADE-WIND Manufacturing, LLC®, at its option, will repair or replace the complete unit or any defective
component without charge. This warranty may be voided if any unauthorized service, alterations, or
repairs are made to the product.
What is NOT Covered:
Normal maintenance and service of any product that has been subject to misuse, negligence, accident,
or installation inconsistent with the recommended TRADE-WIND® Installation Instructions and TRADE-
WIND® Best Practices Guidelines.
Product used other than for normal in-home use or products used outside of the United States and
Canada.
Damage to the product caused by accident, fire, flood, or other acts of God.
Service calls to educate the customer in the proper use and care of the product, change fuses, or to
reset the circuit breakers.
Service calls to correct faulty installation, such as performance issues relating to improperly sized
ducting or restrictive roof caps, are not covered and will, by default, be charged back to the
Homeowner.
Light bulbs are not covered under warranty.
TRADE-WIND Manufacturing, LLC® disclaims and excludes any liability for implied warranties or for
incidental or consequential damages wherever permitted by law. There are no implied warranties of
merchantability or fitness for a particular use or purpose. This warranty gives you specific legal rights, and
you may also have other rights, which vary from state to state.
For Service: If you need service on your TRADE-WIND® Ventilation Product, visit our website at: www. t-
wusa. com and click on the warranty tab. Fill out the simple form providing the model number, serial
number, date of purchase, and brief description of the problem. Proof of purchase will also be required.
PERFORMANCE · QUALITY · CUSTOMER SERVICE
REVISED: JULY 1, 2024
B E S T P R A C T I C E S
V E N T I N G I N S T A L L A T I O N I N S T R U C T I O N S F O R
R A N G E H O O D S A N D W O O D H O O D L I N E R S
( A L L M O D E L S )
IMPORTANT:
ADDENDUM TO INSTALLATION INSTRUCTIONS
Problems caused by the improper installations are not covered by the manufacturer's warranty.
IMPORTANT:
Undersized and improperly installed duct pipe and/or other ventilation components will cause
excessive static pressure (air resistance), that may result in rattling, vibration and air buffeting noises,
as well as inadequate ventilation.
1. BUILDING CODES
Kitchen hood/liners should be installed by qualified technicians familiar with state and local building codes.
2. DUCT PIPE & FITTINGS (ELBOWS, TRANSITIONS, ROOF & WALL CAPS)
a. ) Use round or rectangular rigid metal duct only. Where possible, use round duct as it creates the least amount of static
pressure. IT IS RECOMMENDED THAT YOU DO NOT USE FLEX DUCT
b. ) All duct sections and fittings, should overlap and be connected with at least 3 – 4 equally spaced screws and wrapped
tightly with 2 – 3 layers of Aluminum Foil Metal Duct Tape. This type of duct tape is more durable than traditional cloth duct
tape. DO NOT USE BUTT JOINTS.
c. ) For best air flow, elbows and pipe size transition fittings should not be directly connected to one another. Where
possible, always include at least 15 inches of straight pipe between fittings.
3. DUCT PIPE & FITTING SIZES
(See Duct Sizing Chart and Area Calculations section on page 3 for more details)
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1
DUCT RUNS - LENGTH
a. ) Configure the ventilation duct run to be as short and as direct to the outside as possible. Minimize the number of
elbows and transition fittings used. Complex or long runs should be reviewed by a qualified installer.
b. ) No portion of the ducting should be run so that the exhaust air flows downward. Since exhaust heat rises, forcing
the air to flow downward will cause increased static pressure. As previously mentioned, improperly installed duct pipe
will cause excessive static pressure (air resistance), that may result in rattling, vibration and air buffeting
noises, as well as inadequate ventilation.
c. ) Duct runs for 390 CFM hood/liner models should not exceed 20 linear feet with two 90-degree elbows (or four 45-
degree elbows), a damper and a roof or wall cap. Longer runs or additional elbows will result in decreased ventilation
performance. Each 90-degree elbow is the equivalent of 8 linear feet of duct pipe; each 45-degree elbow is equivalent to
4 linear feet of duct pipe.
IMPORTANT:
The required duct size is indicated by the size of the duct collar on the hood or liner.
IMPORTANT:
No portion of any length of duct pipe or fitting should be smaller than the duct collar of the hood/liner.
This is very important because any type of restriction anywhere in the ventilation system will cause
increased static pressure (air resistance), that may result in rattling, vibration and air buffeting noises,
as well as inadequate ventilation.
d. ) Duct runs for 600 – 1200 CFM hood/liner models should not exceed 35 linear feet with two 90-degree elbows and two
45-degree elbows, a damper and a roof or wall cap. Longer runs or additional elbows will result in decreased ventilation
performance. Each 90-degree elbow is the equivalent of 6 linear feet of duct pipe; each 45-degree elbow is equivalent to 3
linear feet of duct pipe.
e. ) Always run hood/liner ducts to the outdoors. DO NOT terminate a duct into an attic, basement, garage, crawl space
under a house, a chimney, other ducting or an enclosed room.
4. DAMPERS
IMPORTANT:
DO NOT USE SCREWS TO ATTACH ANY TYPE OF DAMPER AS THE SCREWS MAY BLOCK THE DAMPER
BLADES.
IMPORTANT:
DO NOT USE MORE THAN ONE DAMPER IN THE VENTILATION SYSTEM.
NOTE: Many styles of roof caps and wall caps have built-in dampers. See Roof Caps and Wall Caps section for more detail.
Always use carefully crafted, tightly wrapped Aluminum Foil Metal Duct Tape on all connections and physically view and
test the damper blades to make certain they are opening and closing correctly. Make sure that the damper blades do not
touch the duct walls and that there is no debris blocking the free movement of the damper mechanism. Common things
to look for include screws protruding into the blade’s path, overspray of paint, plaster and insulation. If using rectangular
duct, be sure that all four sides of the duct are on the outside of the damper’s duct collar or frame. On hood/liner
installations designed to recirculate the exhaust air back into the kitchen, be sure to remove the aluminum damper blade
before attaching the duct to the damper frame.
a. ) 390 CFM Models
390 CFM models have either a 3. 25” x 10” rectangular metal damper attached directly to the hood/liner or a 7" duct
collar that requires a 7" damper (sold separately).
b. ) 600 – 1200 CFM Models
600-1200 CFM models have either an 8" or 10" round duct collar that requires use of a damper with the
corresponding dimension (sold separately).
In-line Damper: In cold weather areas, installing an “in-line” damper may be the preferred type of installation. This is
because in-line dampers installed just above the perimeter of the heated space (the ceiling) will reduce the amount of
cold air traveling down the duct into the heated space and into the kitchen through the hood/liner. In-line dampers must
be installed so that the exhaust air-flow will open the butterfly blades.
Horizontal duct runs: The in-line damper must be installed so that the hinge between the two butterfly blades is
vertical—the hinge pin must point up and down. Otherwise, because of gravity, the damper’s blades will not close and
the damper will not prevent backdrafts.
Vertical duct runs: The in-line damper’s hinge will be horizontal (sideways), which is correct for vertical duct runs.
Gravity will help close the damper blades after each use.
Upward slanted duct runs: The in-line damper’s hinge must point to the top and bottom sides of the duct. In his
position, gravity will help close the damper blades after each use. Otherwise, because of gravity, the damper’s blades will
not close and the damper will not prevent backdrafts.
Damper in Roof Cap or Wall Cap: In ventilation systems utilizing a roof cap or wall cap with a built-in damper, do not
install an additional in-line damper. Two dampers are unnecessary and will cause increased static pressure (air
resistance), that may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation.
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The roof cap or wall cap is the termination point of the venting system that allows the exhaust air to exit to the outdoors. All
sections of this fitting must have an equal or greater air path area than the hood/liner's duct collar. If any section of the roof
cap or wall cap is smaller than the hood/liner’s duct collar, the entire ventilation system will lose performance and the
restriction will cause increased static pressure.
5. ROOF CAPS & WALL CAPS
IMPORTANT:
Even though the intake side of the roof cap or wall cap may be properly sized, roof caps or wall caps
with built-in dampers must be made so that when the damper is fully open, the actual open area of the
exit point is equal to or greater than the duct collar of the hood/liner. Any undersized portion of a roof
cap or wall cap will cause excessive static pressure that may result in rattling, vibration and air buffeting
noises, as well as inadequate ventilation.
ROOF CAPS AND WALL CAPS MUST HAVE AN INTEGRAL BIRD SCREEN.
6. ATTACHING DUCT TO HOUSE FRAMEWORK
The ventilation system should be attached to the framework in such a manner that the weight of the duct and fittings is
supported with no stress on the duct joints, fittings or on the hood/liner. All ducting should be attached so as to avoid any
possible duct vibration from being transferred to the house’s framework.
7. DUCT SIZING CHART & AREA CALCULATION
DUCT COLLAR TYPES & SIZES
DUCT SIZE
(IN SQ. IN. )
DUCT TYPE REQUIRED
MINIMUM ROOFCAP OR
WALLCAP OPENING SIZE
6" DIAMETER, ROUND - 290 CFM
7" DIAMETER, ROUND - 390 CFM
8" DIAMETER, ROUND - 600 CFM
10" DIAMETER, ROUND - 1200 CFM
3.25" x 10" RECTANGULAR - 390 CFM
6" ROUND METAL DUCT
7" ROUND METAL DUCT
8" ROUND METAL DUCT
10" ROUND METAL DUCT
3. 25" x 10" RECT. METAL DUCT
28. 3"
38. 5"
50. 25"
78. 5"
32. 5"
28. 3"
38. 5"
50. 25"
78. 5"
32. 5"
ROUND DUCT
RADIUS
________
X
X
RADIUS
________
X
X
RADIUS
________
=
=
AREA (SQ. IN)
______________
The “radius” is one-half the diameter of a round duct, e. g. , ½
of a 10” round duct is 5”. 3. 1416 is “Pi”, the “constant” used
when calculating the area of a circle.
RECTANGULAR DUCT OR WALL/ROOF CAP
WIDTH
___________
X
X
DEPTH
___________
=
=
AREA (SQ. IN)
______________
ROOF CAP DRAWING: RECOMMENDED & NOT RECOMMENDED
No Mushroom Cap Style No "Goose-Neck" Style Only use a shape that looks like the
picture shown. Call TRADE-WIND®
Customer Service for any questions.
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AIR
VELOCITY
24.3 ft. / second
24.3 ft. / second
28.6 ft. / second
36.7 ft. / second
28.8 ft. / second
