Amana GUIA Series Service Instructions Manual page 37

PRODUCT DESIGN
Combustion and Ventilation Air Requirements
WARNING
Possible death, personal injury or property damage may
occur if the furnace is not provided with enough fresh
air for proper combustion and ventilation of flue gases.
Most homes require outside air to be supplied to the
furnace area.
Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and es-
cape around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a prob-
lem supplying combustion and ventilation air for gas fired
and other fuel burning appliances. Appliances that pull air
out of the house (clothes dryers, exhaust fans, fireplaces,
etc.) increase the problem by starving appliances for air.
If this furnace is to be installed in the same space with other
gas appliances, such as a water heater, ensure there is an
adequate supply of combustion and ventilation air for the
other appliances. Refer to the latest edition of the National
Fuel Gas Code NFPA 54/ANSI Z223.1 (Section 5.3), or CAN/
CGA B149 Installation Codes (Sections 7.2, 7.3, or 7.4), or
applicable provisions of the local building codes for deter-
mining the combustion air requirements for the appliances.
Most homes will require outside air be supplied to the fur-
nace area by means of ventilation grilles or ducts connect-
ing directly to the outdoors or spaces open to the outdoors
such as attics or crawl spaces.
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 air required for comfort and proper
working conditions for personnel.
(e) A draft hood or a barometric draft regulator shall be installed in
the same room as the equipment served so as to prevent any
difference in pressure between the hood or regulator and the
combustion air supply.
(f) 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.
(g) Air requirements for the operation of exhaust fans, kitchen
ventilation systems, clothes dryers, and fireplaces shall be con-
sidered 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, infiltra-
tion may be adequate to provide air for combustion ventila
tion and dilution of flue gases. However, in buildings of tight
construction (for example, weather stripping, heavily insul
ated, caulked, vapor barrier, etc.), additional air may need to
beprovided 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 cubic feet per 1,000 BTU per hour 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 two permanent openings communicating directly
with other spaces 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 used to determine the required minimum
volume. Each opening shall have a minimum free area of 1 square
inch per 1,000 BTU per hour of the total input rating of all gas
utilization equipment in the confined space, but not less than 100
square inches. One opening shall be within 12 inches of the top
and one within 12 inches of the bottom of the enclosure. The
minimum dimension of air openings shall not be less than 3 inches.
NOTE: Each opening must have
a free area of not less than one
square inch per 1000 BTU of
the total input rating of all equip-
ment in the enclosure, but not
less than 100 square inches.
Equipment Located in Confined Spaces; All Air
from Inside Building. See 5.3.3-a.
Chimney or Gas Vent
Opening
Water
Heater
Furnace
Opening
37
Rev. 1