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CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS
CODE ANSI Z223.1 or NFPA54 which can be obtained from...
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a confined space or unusually tight construction unless provi-
sions are provided for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA 54), defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000 BTU per hour (4.8 m
rating of all appliances installed in that space. An unconfined space is defined as a space whose
volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m
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.
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
or sealed;
b)
weather striping 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 penetra-
tions for plumbing, electrical, and gas lines, and at other openings.
86D0024
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
11
GENERAL INSTALLATION INFORMATION
or
3
per kw) of the aggregate input
2
kg per pa-sec-m
) or less with openings gasketed
3
per kw) of the aggregate
7
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