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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 provisions are provided for
adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1), defines a confined space as a space whose volume is less than 50 cubic feet
per 1,000 BTU per hour (4.8 m
fined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m
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.
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
11
(6 x 10
kg per-pa-sec-m
b)
weather striping has been added on openable windows and doors, and
c)
caulking or sealant are applied to areas such as joints around windows and door frames; between sole plates and doors;
between wall-ceiling joints; between wall panels; at penetrations for plumbing, electrical, and gas lines; and at other
openings.
65D2035
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
3
per kw) of the aggregate input rating of all appliances installed in that space. An uncon-
2
) or less with openings gasketed or sealed, and
GENERAL INSTALLATION INFORMATION
or
3
per kw) of the
7
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