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
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA) or
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE), or consult The Air Systems Design Guide-
lines reference tables available from your local distributor. The
TABLE 1—OPENING DIMENSIONS (IN.)
FURNACE
CASING
WIDTH
APPLICATION
PLENUM OPENING
FLOOR OPENING
A
B
C
D
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. 18—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
Fig. 19—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
—16—
Содержание CONDENSING GAS FURNACE 352MAV
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