Lennox ELITE Series Installation Instructions Manual page 11

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 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 of air and over (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 inches) is preferred.
Removing the Bottom Panel
Screw
Bottom Panel
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FURNACE
FRONT
INDOOR AIR
QUALITY
CABINET
(PCO, Filter
AIR FLOW
Cabinet, etc.)
OPTIONAL
RETURN
AIR BASE
FRONT VIEW
Bottom Cap
FIGURE 13
search engine
Optional Return Air Base
(Upflow Applications Only)
IF BASE
3−1/4
IS USED
(83)
WITHOUT
IAQ CABINET,
A SINGLE
RETURN AIR
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
7−1/4
AIR BASE
(184)
OPENINGS
FIGURE 12
Remove the two screws that secure the bottom cap to the
furnace. Pivot the bottom cap down to release the bottom
panel. Once the bottom panel has been removed, reinstall
the bottom cap. See figure 13.
Do not install the furnace on its front or back.
See figure 14.
Page 11
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
Removing the Bottom Panel
Horizontal Applications
WARNING
Front
FIGURE 14
1
22−7/16
(570)
Overall
(Maximum)
3/4
(19)
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