Ductwork Acoustical Treatment - Bryant 310AAV User Manual

FURNACE
CASING
WIDTH
Upflow Applications on Combustible or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible Flooring
14–3/16
Downflow applications on combustible flooring (KGASB
Downflow Applications on Combustible Flooring with CD5 or
CK5 Coil Assembly or KCAKC coil box (KGASB subbase
Upflow Applications on Combustible or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible Flooring
17–1/2
Downflow applications on combustible flooring (KGASB
Downflow Applications on Combustible Flooring with CD5 or
CK5 Coil Assembly or KCAKC coil box (KGASB subbase
Upflow Applications on Combustible or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible Flooring
21
Downflow applications on combustible flooring (KGASB
Downflow Applications on Combustible Flooring with CD5 or
CK5 Coil Assembly or KCAKC coil box (KGASB subbase
Upflow Applications on Combustible or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible Flooring
24-1/2
Downflow applications on Combustible flooring (KGASB
Downflow Applications on Combustible Flooring with CD5 or
CK5 Coil Assembly or KCAKC coil box (KGASB subbase
120˚
MIN

DUCTWORK ACOUSTICAL TREATMENT

Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-off may require internal
acoustical lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
Table 3—Opening Dimensions (In.)
APPLICATION
(KGASB subbase not required)
subbase required)
not required)
(KGASB subbase not required)
subbase required)
not required)
(KGASB subbase not required)
subbase required)
not required)
(KGASB subbase not required)
subbase required)
not required)
UPFLOW D OWNFLOW
90˚
PREFERRED
PREFERRED
120˚
MIN
PERMITTED
Fig. 14—Duct Flanges
PLENUM OPENING
A
12-11/16
12-9/16
11-13/16
12-5/16
16
15-7/8
15-1/8
15-1/2
19-1/2
19-3/8
18-5/8
19
23
22-7/8
22-1/8
22-1/2
HORIZONTAL
90˚
PREFERRED
PREFERRED
120˚
MIN
PERMITTED
SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
11
FLOOR OPENING
B C
21-5/8 13-5/16 22-1/4
19 13-3/16 19-5/8
19 13-7/16 20-5/8
19 13-5/16
21-5/8 16-5/8 22-1/4
19 16-1/2 19-5/8
19 16-3/4 20-5/8
19 16-1/2
21-5/8 20-1/8 22-1/4
19 20 19-5/8
19 20-1/4 20-5/8
19 20
21-1/8 23-5/8 22-1/4
19 23-1/2 19-5/8
19 23-3/4 20-5/8
19 23-1/2
PREFERRED
PREFERRED
PERMITTED
D
20
20
20
20
A02329