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This furnace may be installed in either an attic or a crawl
space. Either suspend the furnace from roof rafters or floor
joists, as shown in Figure 10, or install the furnace on a
platform, as shown in Figure 13.
Figure 10. Typical Horizontal Application
Unit Suspended in Attic or Crawl Space
AIR FLOW
14-1/2 (368) A Width (65W75)
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.
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 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.
507330-03G / 31-5000662
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 12. Optional Return Air Base
(Upflow Applications Only - For Use with A, B, C and D Cabinets)
Type of Vent
Connector
Top
*Front
Back
Ends
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.
‡ For installation on a combustible floor, do not install the
furnace directly on carpeting, tile or other combustible
materials other than wood flooring.
Figure 11. Horizontal Application Installation
1
3−1/4
(83)
(Maximum)
1
Unit side return air
Opening
5−5/8
7−1/4
(143)
(184)
Issue 2209
Type C
0
2-1/4 in. (57 mm)
2-1/4 in. (57 mm)
0
2 in. (51 mm)
6 in. (152 mm)
0‡
Clearances
23 (584)
Overall
1
Minimum
11 (279)
Maximum
2
1
14 (356)
(Maximum)
SIDE RETURN
AIR OPENINGS
(Either Side)
23
(584)
26−7/8
(683)
SIDE VIEW
Type B
1
0
0
2 in. (51 mm)
1 in. (25 mm)
0‡
22−7/16
(570)
Overall
3/4
(19)
Page 9 of 36
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