CAUTION: The entire length of furnace MUST be
supported when furnace is used in a horizontal position to
ensure proper draining. When suspended, bottom brace
supports sides and center blower shelf. When unit is
supported from the ground, blocks or pad should support
sides and center blower shelf area.
IV. AIR DUCTS
A. General Requirements
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
TABLE 1—OPENING DIMENSIONS (IN.)
FURNACE
CASING
WIDTH
APPLICATION
PLENUM OPENING FLOOR OPENING
ABCD
17-1/2
Upflow Applications 16 24–1/8 16–5/8 24–3/4
Downflow Applications on Non-Combustible Flooring 15-7/8 19 16-1/2 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
15-1/8 19 16-3/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
15-1/2 19 16-1/2 20
21
Upflow Applications 19-1/2 24-1/8 20-1/8 24-3/4
Downflow Applications on Non-Combustible Flooring 19-3/8 19 20 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
18-5/8 19 20-1/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
19 19 20 20
24-1/2
Upflow Applications 23 24-1/8 23-5/8 24-3/4
Downflow Applications on Non-Combustible Flooring 22-7/8 19 23-1/2 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
22-1/8 19 23-3/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box
22-1/2 19 23-1/2 20
Fig. 13—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
Fig. 14—Furnace, Plenum, and Subbase Installed on a
Combustible Floor
A96285
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
—14—
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