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Unit Dimensions − inches (mm)
1
NOTE − 60C and 60D units that require air volumes over 1800 cfm
(850 L/s) must have one of the following:
1.Return air from single side transition will accommodate 20 x 25 x1 in.
(508 x 635 x 25) 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.
See blower performance tables for additional information
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.
AIR FLOW
(19)
3/4
(19)
1
Bottom Return
Air Opening
FRONT VIEW
A
B
9/16 (14)
C
3/4
33
(838)
16
(406)
14−3/4
(375)
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
5/8
(16)
FLUE OUTLET
(Top)
SUPPLY AIR
OPENING
TOP VIEW
D
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
23−3/4
(603)
25
(635)
23
(584)
GAS PIPING INLET
(Either Side)
Side Return
Air Opening
(Either Side)
1
Bottom Return
ELECTRICAL INLET
(Either Side)
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
1−15/16 (49)
14
(356)
9/16
(14)
3 (76) Right
2
FLUE OUTLET
(Either Side)
3−1/4 (83)
1
3−1/4
(83)
SIDE VIEW
3−1/8 (79)
1−1/2 (38)
Front Panel
7 (178) Left
2−3/4 (70) Left
Model No.
A B C D
in. mm, in. mm in. mm in. mm
SL280UH070V36A 14−1/2 368 13−3/8 340 13 330 4−3/4 121
SL280UH090V36B
SL280UH090V48B
17−1/2 446 16−3/8 416 16 406 6−1/4 159
SL280UH090V60C
SL280UH110V60C
21 533 19−7/8 504 19 1/2 495 8 203
SL280UH135V60D 24−1/2 622 23−3/8 546 23 584 9−3/4 248