Ductwork Acoustical Treatment; Supply Air Connections - Bryant 352AAV Installation, Start-Up, And Operating Instructions Manual

FURNACE
CASING
WIDTH
Downflow Applications on Non-Combustible Flooring
17-1/2
Downflow Applications on Combustible Flooring Using KGASB
(445)
Subbase Furnace with or without CAP , CAR, CNPV, CNRV Coil
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase Furnace with CAP , CAR, CNPV, CNRV Coil As-
Downflow Applications on Non-Combustible Flooring
21 Downflow Applications on Combustible Flooring Using KGASB
(533)
Subbase Furnace with or without CAP , CAR, CNPV, CNRV Coil
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase Furnace with CAP , CAR, CNPV, CNRV Coil As-
Downflow Applications on Non-Combustible Flooring
24-1/2 Downflow Applications on Combustible Flooring Using KGASB
(622)
Subbase Furnace with or without CAP , CAR, CNPV, CNRV Coil
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase Furnace with CAP , CAR, CNPV, CNRV Coil As-
PERFORATED
DISCHARGE DUCT
FLANGE
Fig. 24 - - Duct Flanges
When a furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air must also be handled by a duct(s) sealed to
the furnace casing and terminating outside the space containing
the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply-and return-duct connections to furnace with code
approved tape or duct sealer.
Table 3 – Opening Dimensions - - In. (mm)
APPLICATION
Upflow Applications
Assembly or KCAKC Coil Box
sembly or KCAKC Coil Box
Upflow Applications
Assembly or KCAKC Coil Box
sembly or KCAKC Coil Box
Upflow Applications
Assembly or KCAKC Coil Box
sembly or KCAKC Coil Box
NO
YES
210 DEG.
MIN
YES
A93029
PLENUM OPENING
A
16
(406)
15-7/8
(403)
15-1/8
(384)
15-1/2
(394)
19-1/2
(495)
19-3/8
(492)
18-5/8
(473)
19
(483)
23
(584)
22-7/8
(581)
22-1/8
(562)
22-1/2
(572)
Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration. Ductwork passing
through unconditioned space should be insulated to enhance
system performance. When air conditioning is used, a vapor
barrier is recommended.
Maintain a 1-in. (25 mm) clearance from combustible materials to
supply air ductwork for a distance of 36 in. (915 mm)
horizontally from the furnace. See NFPA 90B or local code for
further requirements.
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream.
prevent leaks.

DUCTWORK ACOUSTICAL TREATMENT

Metal duct systems that do not have a 90 degree elbow and 10 ft
(3 M) 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 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.

SUPPLY AIR CONNECTIONS

Upflow Furnaces
Connect supply-air duct to 3/4-in. flange on furnace supply-air
outlet. The supply-air duct attachment must ONLY be connected
to furnace supply-/outlet-air duct flanges or air conditioning coil
casing (when used). DO NOT cut main furnace casing to attach
23
FLOOR OPENING
B C D
24-1/8 16-5/8 24-3/4
(613) (422) (629)
19 16-1/2 19-5/8
(483) (419) (498)
19 16-3/4 20-3/8
(483) (425) (518)
19 16-1/2 20
(483) (419) (508)
24-1/8 20-1/8 24-3/4
(613) (511) (629)
19 20 19-5/8
(483) (508) (498)
19 20-1/4 20-3/8
(483) (514) (518)
19 20 20
(483) (508) (508)
24-1/8 23-5/8 24-3/4
(613) (600) (629)
19 23-1/2 19-5/8
(483) (597) (498)
19 23-3/4 20-3/8
(483) (603) (518)
19 23-1/2 20
(483) (597) (508)
The cover attachment shall