BOTTOM RETURN AIR APPLICATION
G26 UNIT._I_
I I SUPPLYAIR
kl _-J/LENUM
PROPERLY "iX_
SIZED FLOOR I _
OPENING\ \1
FIGURE 3
NOTE - Be careful not to damage glass fiber insulation.
Check for tight seal.
Side Return Air Applications
For installationswhere the return air is taken from a return
air drop, unit may be installed using either the left or right
side of furnace.
For side return air applications, cut furnace cabinet at the
dimensions given on page 2. Embossed corners are pro-
vided on both cabinet sides for return air opening location.
This unit is not equipped with a filter. Filter racks and re-
usable foam filters are available from Lennox in single
kits (44J20 for 14 x 25 filters; 44J21 for 20 x 25 filters) or
10-pack kits (66K61 for 14 x 25 filters; 66K62 for 20 x 25
filters). A filter must be in place anytime the unit is in op-
eration.
Bottom Return Air Applications
1 - Remove blower access panel.
2 - Install filterclips, provided with unit, by slipping folded
section of clipon edge of bottom opening. See figure 4.
3 - Place filter in bottom of blower compartment beneath
rear filterdip. Press downon filter sides. Filterclipsflex
allowing filter to snap into place.
4 - To remove filter, press clipand pullfilter up and out.
BOTTOM RETURN FILTER INSTALLATION
SIDE FILTER CLIPS
BACK
FURNACE FURNACE
FRONT BASE BOTTOM
FIGURE 4
Side Retum Air Applications
An external filter rack, ordered separately, is available from
Lennox.
NOTE - The filter door may be shipped in the rack behind
the filter. If necessary, remove the filter, retrieve the door
and continue with the installation of the rack.
1 - Align filter rack opening with the inside edge of the side
return opening. Bottom of rack should be approx-
imately 1 inches (25mm) from the bottom and 3 inch-
es (76mm) from the front of the unit.
2 - Screw filter rack into place with the eight self-drilling,
self-tapping screws provided. See figure 5.
3 - Push filter door pins through the two holes in filter door
from the inside of the u-channel. See figure 6.
4 - Position filter door on end of filter so that the thumb tab
side of the filter door is away from the fumace. Squeeze
thumb tabs to secure filter to door.
SIDE RETURN FILTER INSTALLATION
BLOWER DECK
L
RETURN 12 In. (305) for
AIR 14in. (356) Filter
OPENING 18 in. (457) for
20 in, (508) Filter
1-15/16(49)in, _
CABINET BASE BOTTOM "/4
RETURN AIR
PLENUM SIZE
t2-3/4 in. X 23-1/2 in. (324 X 597)
for t4 in. (356) Filter
18-3/4 in.x 23-1/2 in. {476 x 597)
for 20 in. (508) Filter
FIGURE 5
FILTER DOOR ASSEMBLY
FILTERDOOR,
PINS
FILTER DO_
FILTER DOOR
PIN _4,
B
ILTER
FIGURE 6
5 - Guide tilter and filterdoor into the filterrack installed on
side of furnace. Push door into filter rack untilsecure.
6 - To remove filter, pull filter door pins until door is re-.-
leased from filter rack.
Page 6
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