subbase, or a factory-approved air conditioning coil casing. DO
NOT cut main furnace casing to attach supply side air duct,
humidifier, or other accessories. All supply-side accessories
MUST be connected to duct external to furnace casing.
Return Air Connections
The return-air duct must be connected to return-air opening
(bottom inlet) as shown in Figure 27. DO NOT cut into casing
sides (left or right). Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace. (See
Figure 27)
FIRE HAZARD
A failure to follow this warning could cause personal
injury, death and/or property damage.
Never connect return-air ducts to the back of the
furnace. Follow instructions below.
Figure 22 _Duct Flanges
_RATED
FLANGE
UPFLOW DOWNFLOW HORIZONTAL
I ......
YES
YES
I ......
YES
\
120°_
MIN
YES YES
NO NO NO
A10493
440 01 4101 03 Specificationssubjecttochange without notice. 21
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