Bryant 310AAV instruction manual Opening Dimensions In. mm, AIR Ducts, General Requirements

Table 4—Opening Dimensions - In. (mm)

FURNACE		PLENUM OPENING		FLOOR OPENING
CASING	APPLICATION
WIDTH		A	B	C	D
	Upflow Applications on Combustible or Noncombustible Floor-	12--- 11/16	21--- 5/8	13--- 5/16	22--- 1/4
	ing (KGASB subbase not required)	(322)	(549)	(338)	(565)
	Downflow Applications on Noncombustible Flooring (KGASB	12--- 9/16	19	13--- 3/16	19--- 5/8
14–3/16	subbase not required)	(319)	(483)	(335)	(498)
	Downflow applications on combustible flooring (KGASB sub-	11--- 13/16	19	13--- 7/16	20--- 5/8
(360)
	base required)	(284)	(483)	(341)	(600)
	Downflow Applications on Combustible Flooring with CNPV,	12--- 5/16	19	13--- 5/16	20
	CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
		(319)	(483)	(338)	(508)
	(KGASB subbase not required)
	Upflow Applications on Combustible or Noncombustible Floor-	16	21--- 5/8	16--- 5/8	22--- 1/4
	ing (KGASB subbase not required)	(406)	(549)	(422)	(565)
	Downflow Applications on Noncombustible Flooring (KGASB	15--- 7/8	19	16--- 1/2	19--- 5/8
17–1/2	subbase not required)	(403)	(483)	(419)	(498)
	Downflow applications on combustible flooring (KGASB sub-	15--- 1/8	19	16--- 3/4	20--- 5/8
(445)
	base required)	(384)	(483)	(425)	(600)
	Downflow Applications on Combustible Flooring with CNPV,	15--- 1/2	19	16--- 1/2	20
	CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
		(394)	(483)	(419)	(508)
	(KGASB subbase not required)
	Upflow Applications on Combustible or Noncombustible Floor-	19--- 1/2	21--- 5/8	20--- 1/8	22--- 1/4
	ing (KGASB subbase not required)	(495)	(549)	(511)	(565)
	Downflow Applications on Noncombustible Flooring (KGASB	19--- 3/8	19	20	19--- 5/8
21	subbase not required)	(492)	(483)	(508)	(498)
	Downflow applications on combustible flooring (KGASB sub-	18--- 5/8	19	20--- 1/4	20--- 5/8
(533)
	base required)	(473)	(483)	(514)	(600)
	Downflow Applications on Combustible Flooring with CNPV,	19	19	20	20
	CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
		(483)	(483)	(508)	(508)
	(KGASB subbase not required)
	Upflow Applications on Combustible or Noncombustible Floor-	23	21--- 1/8	23--- 5/8	22--- 1/4
	ing (KGASB subbase not required)	(584)	(537)	(600)	(565)
	Downflow Applications on Noncombustible Flooring (KGASB	22--- 7/8	19	23--- 1/2	19--- 5/8
24--- 1/2	subbase not required)	(581)	(483)	(597)	(498)
	Downflow applications on Combustible flooring (KGASB sub-	22--- 1/8	19	23--- 3/4	20--- 5/8
(622)
	base required)	(562)	(483)	(603)	(600)
	Downflow Applications on Combustible Flooring with CNPV,	22--- 1/2	19	23--- 1/2	20
	CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
		(572)	(483)	(597)	(508)
	(KGASB subbase not required)

310AAV

AIR DUCTS

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 Guidelines reference tables available from your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in Table 5 - AIR DELIVERY-CFM (With Filter).

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 shall also be handled by 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.

NOTE: Flexible connections should be used between ductwork and furnace to prevent transmission of vibration. Ductwork passing through unconditioned space should be insulated and sealed 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. (914 mm) horizontally from the furnace. See NFPA 90B or local code for further requirements.

Ductwork Acoustical Treatment

NOTE: 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

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. The cover attachment shall prevent leaks.

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