4
ROOM VOLUME FOR VENT FREE
COD
COD
COD
CODE
E
E
ES
S
S
S
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
ADEQ
ADEQ
ADEQ
ADEQU
U
U
UATE
ATE
ATE
ATE C
C
C
COMBU
OMBU
OMBU
OMBUST
ST
ST
STION
ION
ION
ION AN
AN
AN
AND
D
D
D VEN
VEN
VEN
VENT
T
T
TIIIIL
L
L
LA
A
A
AT
T
T
TION
ION
ION
ION AIR
AIR
AIR
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/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 m3 per kw) of the aggregate input 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 m3 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.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
•
walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder
with a rating of 1 perm (6 x 1011 kg per pa-sec-m2) or less with openings gasketed or sealed;
•
weather stripping has been added on operable windows and doors, and
•
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.
WARNING:
This heater shall not be installed in a room or space unless the required volume of indoor
combustion air is provided by the method described in the National Fuel Gas Code, ANSI Z223.1/NFPA
54, the International Fuel Gas Code, or applicable local codes.
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