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20
© 2020 United States Stove Company
VENTILATION
PRODUCING ADEQUATE AIR FOR
COMBUSTION AND VENTILATION
This section is for residential or manufactured
(mobile) installation. This heater shall not be
installed in unusually tight construction unless
provisions are adequate for combustion and
ventilation air.
NOTE: This heater shall not be installed in a room
or space unless the required volume of indoor
combustion air is provided by the method in
National Fuel Gas Code, ANSIZ223.1/NFPA 54, the
International Fuel Gas Code, or applicable codes.
National Fuel Gas Code, ANSI Z223.1/NFPA 54
denes unusually tight construction or unconned
space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8m 3 per kW)
of aggregate input rating of all appliances installed
in that space and an unconned space as a space
whose volume is not less than 50 cubic feet per
1,000 BTU per hour (4.8m 3 per kW) of aggregate
input rating of all appliances installed in that space.
Rooms communicating directly with space in
which appliances are installed, through openings
not furnished with doors, are considered a part of
unconned space. Unusually tight construction is
dened as construction where:
A. Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
retarder with a rating of 1 perm (6 x 10-11kg per
pa-sec-m2) or less with openings gasketed or
sealed.
B. Weatherstripping has been added on openable
windows and doors.
C. Caulking or sealants are applied to areas such
as joints around window and door frames,
between sole plates and oors, between
wall-ceiling joints, between wall panels, at
penetrations for plumbing, electrical and gas
lines and other openings.
NOTE: SOME AREAS IN THE UNITED STATES HAVE
HIGHER REQUIREMENTS FOR CUBIC FEET PER
1000 BTU/ HOUR INPUT. (EX. CINCINNATI, OHIO
CODES REQUIRE 70 CUBIC FEET). CHECK YOUR
LOCAL CODE BEFORE INSTALLATION
DETERMINING FRESH-AIR FLOW FOR
HEATER LOCATION
Determine if you have unusually tight construction
or unconned space. Use this worksheet to
determine if you have unusually tight construction
or unconned space. Space: Includes the room in
which you will install heater plus adjoining rooms
with doorless passageways or ventilation grills
between the rooms.
WARNING:
IF AREA IN WHICH HEATER MAY BE OPERATED
DOES NOT MEET THE REQUIRED VOLUME FOR
INDOOR COMBUSTION AIR, COMBUSTION
AND VENTILATION AIR SHALL BE PROVIDED
BY ONE OF THE METHODS DESCRIBED IN
NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA
54, THE INTERNATIONAL FUEL GAS CODE OR
APPLICABLE CODES.
WARNING:
IF AREA IN WHICH HEATER MAY BE
OPERATED IS SMALLER THAN THAT DEFINED
AS AN UNCONFINED SPACE OR IF BUILDING
IS OF UNUSUALLY TIGHT CONSTRUCTION,
PROVIDE ADEQUATE AIR FOR COMBUSTION
AND VENTILATION BY ONE OF THE METHODS
DESCRIBED IN NATIONAL FUEL GAS CODE,
ANSI Z223.1/NFPA 54 AIR FOR COMBUSTION
AND VENTILATION OR APPLICABLE LOCAL
CODES.
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