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AIR FLOW
17−1/2 (446) B Width (68W62)
21 (533) C Width (68W63)
24−1/2 (622) D Width (68W64)
FRONT VIEW
NOTE: Optional side return air filter kits are not for use with return air base.
1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening.
The size of the opening must not extend beyond the markings on the furnace cabinet.
2 To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the
furnace. Pivot the bottom cap down to release the bottom
panel. Once the bottom panel has been removed, reinstall
the bottom cap. See Figure 16.
Figure 16. Removing the Bottom Panel
Page 12 of 60
FURNACE
FRONT
IF BASE
IS USED
WITHOUT
IAQ CABINET,
INDOOR AIR
A SINGLE
QUALITY
RETURN AIR
CABINET
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
AIR BASE
OPENINGS
OPTIONAL
RETURN
AIR BASE
Figure 15. Optional Return Air Base
(Upflow Applications Only)
Issue 2327
1
23 (584)
3−1/4
Overall
(83)
(Maximum)
1
Unit side return air
Opening
SIDE RETURN
5−5/8
7−1/4
AIR OPENINGS
(143)
(184)
26−7/8
(683)
SIDE VIEW
Horizontal Applications
Do not install the furnace on its front or its back. See
Figure 13.
This furnace can be installed in horizontal applications with
either right or left hand air discharge.
Refer to Figure 18 for clearances in horizontal applications.
1
Minimum
11 (279)
Maximum
2
1
22−7/16
14 (356)
(570)
Overall
(Maximum)
(Either Side)
23
(584)
(19)
WARNING
Figure 17.
3/4
508390-01
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