Page 2
Unit Dimensions - inches (mm)
2
Flue outlet may be horizontal but furnace must be
vented vertically
3
Optional external side return air filter kit cannot be used
with the optional RAB Return Air Base.
1
NOTE - 20C and 20D units that require air volumes
over 1800 cfm (850 L/s) 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) cleanable air
filter. (Required to maintain proper air velocity.)
2. Single side return with optional return air base.
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
See Blower Performance Tables for additional information.
23
(584)
(19)
3/4
(19)
1
Bottom Return
Air Opening
GAS PIPING INLET
(Either Side)
Side Return
Air Opening
(Either Side)
1
Bottom Return
Air Opening
FLUE OUTLET
(Top)
ELECTRICAL INLET
(Either Side)
SUPPLY AIR
OPENING
TOP VIEW
A
B
9/16 (14)
C
D
3/4
27−3/4
(705)
19−7/16
(494)
23−1/2
(597)
1−1/2
(38)
9−1/8 (232) Right
8−5/8 (219) Left
5−3/8 (137) Right
1−9/16 (40) Left
33
(838)
3−1/8 (79)
1−15/16 (49)
14
(356)
9/16
(14)
3 (76) Right
6−3/4 (171) Left
2
FLUE OUTLET
(Either Side)
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
16
(406)
14−3/4
(375)
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
3−1/4 (83)
5/8
(16)
1
3−1/4
(83)
23−3/4
(603)
25
(635)
Front Panel
ELECTRICAL
INLET (Either Side)
(Either Side)
11/16 (17)
80AF1UH Model No.
A
B
C
D
in.
mm
in.
mm
in.
mm
in.
mm
045P12A
070P12A
14-1/2
368
13-3/8
340
13
330
4-3/4
121
090P12B
090P16B
17-1/2
446
16-3/8
416
16
406
6-1/4
159
110P16C
110P20C
21
533
19-7/8
504
19-1/2
495
8
203
135P20D
24-1/2
622
23-3/8
546
23
584
9-3/4
248