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Return Air Connections
FIRE HAZARD
Failure to follow this warning could cause a fire, personal
injury, or death.
Never connect return-air ducts to the back of the furnace.
Follow instructions below.
Downflow Furnaces
The return-air duct must be connected to return-air opening
(bottom inlet) as shown in Fig. 19. DO NOT cut into casing sides
(left or right). Side opening is permitted for only upflow and most
horizontal furnaces. Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace.
Upflow and Horizontal Furnaces
The return-air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing as shown in Fig. 18 and 20. Bypass humidifier may be
attached to unused side return air side of the furnace casing. (See
Fig. 18 and 20.)
Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)
Fig. 14—Duct Flanges
A02329
UPFLOW
OWNFLOW
HORIZONTAL
PREFERRED
PERMITTED
PREFERRED
PREFERRED
PREFERRED
120˚
MIN
PREFERRED
120˚
MIN
PREFERRED
120˚
MIN
90˚
90˚
PERMITTED
PERMITTED
D
→
Fig. 15—Horizontal Unit Suspension
A05027
1
/
4
" THREADED ROD
4 REQ.
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3 #8 x
3
/
4
" SCREWS
TYPICAL FOR 2 SUPPORTS
1" SQUARE, 1
1
/
4
" x 1
1
/
4
" x
1
/
8
" ANGLE IRON
OR UNI-STRUT MAY BE USED
(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD
8" MIN FOR DOOR
REMOVAL
OUTER DOOR
ASSEMBLY
14