Lennox ML193UH Instruction Manual page 12

OPTIONAL ACCESSORY DIMENSIONS - INCHES (MM)
HORIZONTAL (END) FILTER KIT
24−3/4
(629)
5/8
(16)
B
RETURN
A
AIR
OPENING
5/8
(16)
23−1/2
(597)
5/8
(16)
SIDE VIEW
CONDENSATE
TRAP
17-1/2 (446) B Width (50W98)
21 (533) C Width (50W99)
24-1/2 (622) D Width (51W00)
NOTE- Optional Side Return Air Filter Kits are not for use with Optional Return Air Base.
1
Both 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.
2
To minimize pressure drop, the largest opening height possible, up to 14 in. (356 mm), is preferred.
ML193UH / Page 12
1-1/4
5/8
(16)
AIR FLOW
AIR FILTER
(Furnished)
FRONT VIEW
Optional Return Air Base
(Upflow Applications Only - For use with B, C and D cabinets)
FURNACE
FRONT
IF BASE
IS USED
WITHOUT
IAQ CABINET,
INDOOR AIR
A SINGLE
QUALITY
RETURN AIR
CABINET PLENUM
MUST
(PCO, Filter
COVER BOTH
Cabinet, etc.)
UNIT AND
RETURN
AIR BASE
OPENINGS
OPTIONAL
RETURN
AIR BASE
(32)
Furnace
Catalog
Cabinet
Number
Width
B 89L96
C 89L97
D 89L98
3-1/4
(83)
7-1/4
(184)
A
in. mm
18 457 16-3/4
21 533 18-3/4
25 635 23-3/4
1
23 (584)
Overall
1
(Maximum) Minimum
11 (279)
Maximum
2
1
Unit side return air
14 (356)
Opening
SIDE RETURN
5-5/8
AIR OPENINGS
(143)
(Either Side)
23
(584)
26-7/8
(683)
SIDE VIEW
B
in. mm
425
476
603
1
22-7/16
(570)
Overall
(Maximum)
3/4
(19)