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43D0122 7
GENERAL INSTALLATION INFORMATION
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…
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a confi ned space or unusually tight construction unless provisions are provided
for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54), defi nes a confi ned space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m
3
per kw) of the aggregate input rating of all appliances installed in that
space, and an unconfi ned space is defi ned as a space whose volume is not less than 50 cubic feet per 1,000 BTU per
hour (4.8 m
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 unconfi ned 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
11
kg/pa-sec-m
2
) or less with openings gasketed 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 fl oors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas
lines, and at other openings.