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Top/Plenum
*Front
Back
Sides
Vent
Floor
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
† Allow proper clearances to accommodate condensate trap.
‡ For installations on a combustible floor, do not install
the furnace directly on carpeting, tile or other combustible
materials other than wood flooring.
Figure 13. Upflow Applications
Installation Clearances
CONDENSATE
TRAP
17−1/2 (446) B Width (68W62)
21 (533) C Width (68W63)
NOTE: Optional side return air filter kits are not for use with return air base.
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
1
Minimum unit side return air opening dimensions for units requiring 1800 cfm of air and over (W x H): 23 x 11 in. (584 x279 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.
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
2
507867-02
1 in. (25 mm)
0
0
0†
0
0‡
FURNACE
FRONT
INDOOR AIR
QUALITY
CABINET
AIR FLOW
OPTIONAL
RETURN
AIR BASE
FRONT VIEW
Figure 15. Optional Return Air Base
(Upflow Applications Only)
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on Page 2.
Furnace applications which include side return air and a
condensate trap installed on the same side of the cabinet
(trap can be installed remotely within 5 ft.) require either a
return air base or field-fabricated transition to accommodate
an optional IAQ accessory taller than 14.5". See Figure 14.
IF BASE
3−1/4
IS USED
(83)
WITHOUT
IAQ CABINET,
A SINGLE
RETURN AIR
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
7−1/4
AIR BASE
(184)
OPENINGS
Issue 1922
Figure 14. Side Return Air
(with Transition and Filter)
1
23 (584)
Overall
1
(Maximum)
Minimum
11 (279)
Maximum
2
1
Unit side return air
14 (356)
Opening
SIDE RETURN
5−5/8
AIR OPENINGS
(143)
(Either Side)
23
(584)
26−7/8
(683)
SIDE VIEW
1
22−7/16
(570)
Overall
(Maximum)
3/4
(19)
Page 11 of 55
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