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Whirlpool WGFM195 Installation Instructions Manual page 9

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The following information on air for combustion and ventilation is
reproduced from the National Fuel Gas Code NFPA 54/ANSI
Z223.1 Section 5.3.
5.3.1 General:
a) The provisions of 5.3 apply to gas utilization equipment
installed in buildings and which require air for
combustion, ventilation and dilution of flue gases from
within the building. They do not apply to (1) direct vent
equipment which is constructed and installed so that all
air for combustion is obtained from the outside
atmosphere and all flue gases are discharged to the
outside atmosphere, or (2) enclosed furnaces which
incorporate an integral total enclosure and use only
outside air for combustion and dilution of flue gases.
b) Equipment shall be installed in a location in which the
facilities for ventilation permit satisfactory combustion of
gas, proper venting and the maintenance of ambient
temperature at safe limits under normal conditions of use.
Equipment shall be located so as not to interfere with
proper circulation of air. When normal infiltration does not
provide the necessary air, outside air shall be introduced.
c) In addition to air needed for combustion, process air shall
be provided as required for: cooling of equipment or
material, controlling dew point, heating, drying, oxidation
or dilution, safety exhaust, odor control and air for
compressors.
d) In addition to air needed for combustion, air shall be
supplied for ventilation, including all the air required for
comfort and proper working conditions for personnel.
e) While all forms of building construction cannot be
covered in detail, air for combustion, ventilation and
dilution of flue gases for gas utilization equipment vented
by natural draft normally may be obtained by application
of one of the methods covered in 5.3.3 and 5.3.4.
f)
Air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothes dryers and fireplaces
shall be considered in determining the adequacy of a
space to provide combustion air requirements.
5.3.2 Equipment Located in Unconfined Spaces:
In unconfined spaces (see definition below) in buildings,
infiltration may be adequate to provide air for combustion
ventilation and dilution of flue gases. However, in buildings of
tight construction (for example, weather stripping, heavily
insulated, caulked, vapor barrier, etc.), additional air may need to
be provided using the methods described in 5.3.3-b or 5.3.4.
Space, Unconfined.
For purposes of this Code, a space whose volume is not less
than 50 cu ft per 1,000 Btu/h 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.
5.3.3 Equipment Located in Confined Spaces:
a) All Air from Inside the Building: The confined space shall
be provided with 2 permanent openings communicating
directly with an additional room(s) of sufficient volume so
that the combined volume of all spaces meets the criteria
for an unconfined space. The total input of all gas
utilization equipment installed in the combined space
shall be considered in making this determination. Each
opening shall have a minimum free area of 1 sq. in.
2
(6.5 cm
) per 1,000 Btu/h of the total input rating of all gas
utilization equipment in the confined space, but not less
than 100 sq. in (645.2 cm
12" (30.5 cm) of the top and one within 12" (30.5 cm) of
the bottom of the enclosure.
2
). One opening shall be within
Equipment Located in Confined Spaces: All Air from Inside
Building. See 5.3.3-a.
NOTE: Each opening must have a free area of not less than
2
1 sq. in. (6.5 cm
) per 1,000 Btu of the total input rating of all
equipment in the enclosure, but not less than 100 sq. in.
(645.2 cm
2
).
A
D
A. Chimney or gas vent
B. Opening(s)
b) All Air from Outdoors: The confined space shall be
provided with 2 permanent openings, one commencing
within 12" (30.5 cm) of the top and one commencing
within 12" (30.5 cm) of the bottom of the enclosure. The
openings shall communicate directly, or by ducts, with
the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.
1. When directly communicating with the outdoors, each
opening shall have a minimum free area of 1 sq. in.
(6.5 cm
2
) per 4,000 Btu/h of total input rating of all
equipment in the enclosure.
Equipment Located in Confined Spaces: All Air from
Outdoors—Inlet Air from Ventilated Crawl Space and
Outlet Air to Ventilated Attic. See 5.3.3-b.
NOTE: The inlet and outlet air openings must each have a free
area of not less than 1 sq. in. (6.5 cm
input rating of all equipment in the enclosure.
G
H
A. Chimney or gas vent
B. Ventilation louvers
(each end of attic)
C. Outlet air
D. Inlet air
B
C
B
C. Water heater
D. Furnace
2
) per 4,000 Btu of the total
A
B
C
F
D
E
E. Ventilation louvers for
unheated crawl space
F. Water heater
G. Furnace
H. Alternate air inlet
9

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