Installation Guide

507324-01Page 2 of 32 Issue 1722
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C
23-1/2
(597)
25 (635)
D
3-1/4
(83)
23
(584)
14
(356)
15-1/2
(394)
23-7/8
(606)
30
(762)
26
(660)
19-1/2 (495)
28-3/8 (721)
B
33
(838)
A
1
NOTE - 20C and 20D size units installed in upow applications
that require air volumes of 1800 cfm (850 L/s or greater must
have one of the following:
1. Single side return air with transition, to accommodate 20 x 25
x 1 in. (508 x 635 x 25 mm) air lter.
2. Single side return air with optional RAB Return Air Base
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
2
Flue outlet may be horizontal but furnace must be vented
vertically.
3
Optional external side return air lter kit cannot be used with
the optional RAB Return Air Base.
* Consider sizing requirements for optional IAQ equipment
before cutting side return opening.
Model Number A B C D
A80UH / 80G1UH in. mm in. mm in. mm in. mm
045-08
14-1/2 368 13-3/8 340 13 330 4-3/4 121
045-12
070-08
070-12
090-12
17-1/2 446 16-3/8 416 16 406 6-1/4 159
090-16
110-12
21 533 19-7/8 504 19-1/2 495 8 203
110-16
110-20
135-20
24-1/2 622 23-3/8 546 23 584 9-3/4 248
Unit Dimensions