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Do not install furnace on its back. Safety control operation
will be adversely affected. Never connect return-air ducts to
back of furnace. Failure to follow this warning could result in
fire, personal injury, or death.
Step 5—Downflow Installation
NOTE: This furnace is approved for use on combustible materials
or wood flooring. A factory accessory floor base, as listed on the
furnace rating plate, MUST be used. A factory accessory floor
base is not required when this furnace is installed on manufactur-
er’s Coil Assembly Part No. CD5 or CK5, or Coil Box Part No.
KCAKC is used.
1. Determine application being installed from Table 3.
2. Construct hole in floor per dimensions specified in Table 3
and Fig. 5.
3. Construct plenum to dimensions specified in Table 3.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 6.
Table 3—Opening Dimensions (In.)
FURNACE
CASING
WIDTH
APPLICATION
PLENUM OPENING FLOOR OPENING
ABCD
14-3/16
Non-Combustible Flooring 12-11/16 19 13-3/8 19-5/8
Combustible Flooring Using KGASB Subbase 11-13/16 19 13-7/16 20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
12-5/16 19 13-5/16 20
17-1/2
Non-Combustible Flooring 16 19 16-5/8 19-5/8
Combustible Flooring Using KGASB Subbase 15-1/8 19 16-3/4 20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
15-1/2 19 16-1/2 20
21
Non-Combustible Flooring 19-1/2 19 20-1/8 19-5/8
Combustible Flooring Using KGASB Subbase 18-5/8 19 20-1/4 20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
19 19 20 20
24-1/2
Non-Combustible Flooring 23 19 23-5/8 19-5/8
Combustible Flooring Using KGASB Subbase 22-1/8 19 23-3/4 20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
22-1/2 19 23-1/2 20
Fig. 5—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
A93043
FRONT
BACK
FRONT
B
A
C
K
7
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