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NOTE - 20C and 20D size units installed in upflow applications
1
that require air volumes of 1800 cfm (850 L/s or greater must
have one of the following:
1. Return air from single side transition will accommodate
20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter.
(Required to maintain proper air velocity.)
2. Single side return air with optional RAB Return Air Base
3. Return Air from bottom and one side.
4. Return air from both sides.
5. Return air from bottom.
Flue outlet may be horizontal but furnace must be vented
2
vertically.
3
Optional external side return air filter kit cannot be used with
the optional RAB Return Air Base.
*
Consider sizing requirements for optional IAQ equipment before
cutting side return opening.
FRONT VIEW
Model
A801UH2V/80G1UH2V
070-12
090-12
090-16
090-20
110-20
135-20
Page 2 of 41
A80UH2V & 80G1UH2V Unit Dimensions - inches (mm)
A
in.
mm
14-1/2
368
17-1/2
446
21
533
24-1/2
622
B
in.
mm
13-3/8
340
416
16-3/8
19-7/8
504
19-1/2
23-3/8
546
Issue 1034
SIDE VIEW
C
in.
mm
in.
13
330
4-3/4
406
6-1/4
16
495
8
584
9-3/4
23
D
mm
121
159
203
248
506471-01
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