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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 in-
door combustion air is provided by the method in the National Fuel Gas Code, ANSIZ223.1/
NFPA 54, the International Fuel Gas Code, or applicable codes.
The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines unusually tight construction or
unconfined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour
(4.8m
3
per kw) of the aggregate input rating of all appliances installed in that space and an
unconfined 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 the aggregate input rating of all appliances installed in that space.
Rooms communicating directly with the space in which the appliances are installed, through
openings not furnished with doors, are considered a part of the unconfined space.
WARNING: IF THE AREA IN WHICH THE HEATER MAY BE OPERATED DOES
NOT MEET THE REQUIRED VOLUME FOR INDOOR COMBUSTION AIR, COM-
BUSTION AND VENTILATION AIR SHALL BE PROVIDED BY ONE OF THE
METHODS DESCRIBED IN THE NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA
54, THE INTERNATIONAL FUEL GAS CODE, OR APPLICABLE CODES.
WARNING: IF THE AREA IN WHICH THE HEATER MAY BE OPERATED IS
SMALLER THAN THAT DEFINED AS AN UNCONFINED SPACE OR IF THE
BUILDING IS OF UNUSUALLY TIGHT CONSTRUCTION, PROVIDE ADEQUATE
AIR FOR COMBUSTION AND VENTILATION BY ONE OF THE METHODS
DESCRIBED IN THE NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA 54 AIR FOR
COMBUSTION AND VENTILATION, OR APPLICABLE LOCAL CODES.
Unusually tight construction is defined 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
-11
kg per pa-sec-m
2
) or less with openings gasketed
or sealed;
b) Weather stripping has been added on openable windows and doors, and
c) Caulking or sealants are applied to areas such as joints around window and door frames,
between sole plates and floors, between wall-ceiling joints, between wall panels, at
penetrations for plumbing, electrical, and gas lines, and at 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 UNCONFINED SPACE
Use this worksheet to determine if you have confined or unconfined space.
SPACE: Includes the room in which you will install heater plus adjoining rooms with
doorless passageways or ventilation grills between the rooms.
Summary of Contents for FP-327-ZC
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