507769C05 Page 11 of 55
3. Set the unit over the plenum and seal the plenum to
the unit.
4. Ensure that the seal is adequate.
Table 1. Non-Combustible Floor Opening Size
Cabinet Width
Front to Rear Side to Side
in. mm in. mm
B (17.5”) 19-3/4 502 16-5/8 422
C (21”) 19-3/4 502 20-1/8 511
NOTE: Floor opening dimensions listed are 1/4 inch (6 mm)
larger than the unit opening. See dimension drawing on Page
2.
Figure 14.
SUPPLY AIR
PLENUM
PROPERLY
SIZED FLOOR
OPENING
FURNACE
NON-COMBUSTIBLE
FLOORING
Installation on Combustible Flooring
See Figure 15
1. When unit is installed on a combustible oor, a
downow combustible ooring base must be installed
between the furnace and the oor. The base must be
ordered separately. See Table 2 for opening size to
cut in oor.
The furnace and combustible ooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood ooring.
CAUTION
Table 2. Combustible Floor Base Opening Size
Cabinet
Width
Catalog
Number
Front to Rear Side to Side
in. mm in. mm
B (17.5”) 11M60 22 559 18-3/4 476
C (21”) 11M61 22 559 22-3/4 578
Figure 15.
FURNACE
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
PROPERLY
SIZED FLOOR
OPENING
FLOORING
COMBUSTIBLE
2. After opening is cut, set the combustible ooring base
into opening.
3. Check berglass strips on the combustible ooring
base to make sure they are properly glued and
positioned.
4. Lower supply air plenum into the combustible ooring
base until plenum anges seal against berglass
strips.
NOTE: Be careful not to damage berglass strips.
Check for a tight seal.
5. Set the furnace over the plenum.
6. Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Coil Cabinet
See Figure 16
Figure 16.
COOLING COIL
PLENUM
PROPERLY
SIZED FLOOR
OPENING
FURNACE
NOTE: Downow combustible ooring kit is not used.
1. Refer to reverse-ow coil installation instructions for
correctly sized opening in oor and installation of
cabinet.
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