40
(1016)

A

UP−FLOW POSITION

B

G43UF / Page 10
OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)
1Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air
opening. The size of the opening must not extend beyond the markings on the furnace cabinet.
214 inches (356 mm) is the maximum size the height of the unit opening can be cut. This may interfere with the condensate drain
(if located on the same side of the unit as the opening).
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.

RAB RETURN AIR BASE (Up−Flow Applications Only)

For use with B, C, and D size furnaces only

1 Unit side return
air Opening

SIDE VIEW

27−5/8 (702)
4
(102)
1 23 (584)
Overall
(Maximum)
1 Minimum
11 (279)
2 Maximum
14 (356)
OPTIONAL RAB
RETURN AIR BASE
20−1/2 (521)
6 (152)
7/8
(22)
3/4
(19)
1 18−1/2
(470)
Overall
(Maximum)
SIDE RETURN
AIR OPENINGS
(Either Side)
FURNACE
FRONT
14
(356)
14
(356)
CONDENSATE
TRAP
4
(102)

FRONT VIEW

21 (533) RAB−C−6 (74M74)
24−1/2 (622) RAB−D−6 (74M75)
17−1/2 (446) RAB−B−6 (76M88)
5
(102)
AIR FLOW
DIMENSIONS − INCHES (MM) − FURNACE/COIL COMBINED DIMENSIONS
Cased Uncased (CX34 − cased only)
Model No AB A B
Model
No
in. mm in. mm in. mm in. mm
CX34−18/24B−6F
CX34−18/24C−6F
C33−24B
C33−24C 16−1/2 419 56−1/2 1435 13−7/8 352 53−7/8 1368
CX34−25B−6F C33−25B 19−1/2 495 59−1/2 1511 15−7/8 403 55−7/8 1419
CX34−30B−6F
CX34−30C−6F
C33−30B
C33−30C 20−1/2 521 60−1/2 1537 17−3/4 451 59−3/4 1467
CX34−31B−6F C33−31B 23−1/2 597 63−1/2 1613 20−1/4 514 60−1/4 1530
CX34−36B−6F C33−36B 24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572
CX34−36C−6F C33−36C 24−1/2 622 64−1/2 1638 21−1/4 540 61−1/4 1556
CX34−38B−6F C33−38B 24−1/2 622 64−1/2 1638 22 559 62 1575
CX34−42B−6F C33−42B 24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572
CX34−43B−6F C33−43B 28−1/2 724 68−1/2 1740 26−1/4 667 66−1/4 1683
CX34−43C−6F C33−43C 28−1/2 724 68−1/2 1740 25−3/4 654 65−3/4 1670
C33−44C 24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562
CX34−44/48B−6F C33−48B 24−1/2 622 64−1/2 1638 22−1/8 562 62−1/8 1578
CX34−44/48C−6F C33−48C 24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562
CX34−49C−6F C33−49C 30−1/2 775 70−1/2 1791 28−1/2 724 68−1/2 1740
CX34−50/60C−6F C33−50/60C 27−1/2 699 67−1/2 1715 24−3/4 629 64−3/4 1645
CX34−60D−6F C33−60D 25−1/2 648 65−1/2 1664 24−3/4 629 64−3/4 1645
CX34−62C−6F C33−62C 32−1/2 826 72−1/2 1842 30−5/8 778 70−5/8 1793
CX34−62D−6F C33−62D 29−1/2 749 69−1/2 1765 28−3/4 730 68−3/4 1746