Unit Dimensions - Lennox G40UH Series Installation Instructions Manual

G40UH(X) Unit Dimensions − inches (mm)
*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 with transition which will
accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm)
cleanable air filter. (Required to maintain proper air
velocity.)
2. Return air from single side with optional RAB Return
Air Base.
3. Return air from bottom.
4. Return air from both sides.
5. Return air from bottom and one side.
Refer to Engineering Handbook for additional information.
**Flue outlet may be horizontal but furnace must be
vented vertically

Optional external side return air filter kit cannot be used
with the optional RAB Return Air Base.
A
B
AIR FLOW
3/4 (19)
C
*Bottom Return
Air Opening
FRONT VIEW
Model No Model No.
G40UH−24A−045,
G40UH−24A−070,
G40UH−36A−045,
G40UH−36A−070
G40UH−36B−090,
G40UH−48B−070,
G40UH−48B−090
G40UH−36B−110,
G40UH−48C−110,
G40UH−48C−135,
G40UH−60C−110
G40UH−60D−135
G40UH−60D−155
9/16 (14)

OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
40
(1016)
14−3/4
(375)
16
(406)
5/8 (16)
3/4 (19)
A
in. mm
14−1/2 368 13−3/8
17−1/2 446 16−3/8
21 533 19−7/8
24−1/2 622 23−3/8
3−3/4 (95)
D
FLUE OUTLET
(Top)

OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
TOP VIEW
3−1/4 (83) Right
8−1/8 (206) Left
3−3/4
(95)
14 (356) Right
13−1/4 (337) Left
4−7/8 (124) Right
2−1/4 (57) Left
4
(102)
4−1/4
(108)
B
in. mm in.
340 13
416 16
454 19−1/2
546 23
Page 2
SUPPLY AIR
OPENING
23-3/4 (603)
25 (635)
TOP VIEW
28−1/2
(724)
19−7/16
(494)
**FLUE OUTLET
(Either Side)
ELECTRICAL INLET
(Either Side)
GAS PIPING INLET
(Either Side)
ELECTRICAL INLET
(Either Side)
23
(584)
14
*Side Return
(356)
Air Opening
(Either Side)
1−15/16 (49)
23−1/2
(597)
*Bottom Return
Air Opening
SIDE VIEW
C D
mm in.
330 4−1/2
406 6
495 7−3/4
584 9−1/2
9/16
(14)
mm
114
152
197
241