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Combustion & Ventilation Air Requirements
T
O AVOID PROPERTY DAMAGE
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED
SUPPLIED INTO THE FURNACE AREA
Improved construction and additional insulation in buildings have
reduced heat loss by reducing air infiltration and escape around
doors and windows. These changes have helped in reducing
heating/cooling costs but have created a problem 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.
House depressurization can cause back drafting or improper
combustion of gas-fired appliances, thereby exposing building
occupants to gas combustion products that could include carbon
monoxide.
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 all appliances. Re-
fer to the latest edition of the National Fuel Gas Code NFPA
54/ANSI Z223.1 or applicable provisions of the local building
codes for determining 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 connecting
directly to the outdoors or spaces open to the outdoors such
as attics or crawl spaces.
Installation Positions
This furnace may be installed in an upright position or horizontal
on either the left or right side panel. Do not install this furnace on
its back. For upright upflow furnaces, return air ductwork may
be attached to the side panel(s) and/or basepan. For horizon-
tal upflow furnaces, return air ductwork must be attached to
the basepan. For both upright or horizontal furnaces, return
ductwork must be attached to the basepan (top end of the
blower compartment). NOTE: Ductwork must never be at-
tached to the back of the furnace. Contact your distributor for
proper airflow requirements and number of required ductwork
connections. Refer to "Recommended Installation Positions"
figure for appropriate installation positions, ductwork connec-
tions, and resulting airflow arrangements.
WARNING
,
,
PERSONAL INJURY OR DEATH
. M
OST HOMES REQUIRE OUTSIDE AIR BE
.
Alternate Vent/Flue Location
Recommended Installation Positions
Horizontal Applications & Considerations
When installing a furnace horizontally, additional consideration
must be given to the following:
Furnace Suspension
If suspending the furnace from rafters or joists, use 3/8" threaded
rod and 2"x2"x1/8" angle iron as shown in the following dia-
gram. The length of rod will depend on the application and
the clearances necessary.
If the furnace is installed in a crawl space it must be sus-
pended from the floor joist or supported by a concrete pad.
Never install the furnace on the ground or allow it to be
exposed to water.
8
Figure 2A
Figure 2B
Figure 2C
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