Bryant 120 instruction manual Air for Combustion, Ventilation and Dilution for Outdoors

1 SQ IN.

DUCTSPER 4000

TOBTUH* OUTDOORS

CIRCULATING AIR		VENT THROUGH ROOF
	DUCTS

12″ MAX

1 SQ IN.

PER 2000 B BTUH*

DUCTS

TO

OUTDOORS

1 SQ IN.

PER 2000 A BTUH*

12″ MAX

CLEARANCE IN FRONT CIRCULATING OF COMBUSTION AIR AIR DUCTS OPENINGS SHALL BE AT LEAST 3 IN.

D12″

VENTMAX

THROUGH	F
ROOF
		1 SQ IN.
		PER
	4000
		BTUH*
		OUTDOORS
		1 SQ IN.
		PER
	4000
		BTUH*

E G

12″

C MAX 12″ MAX

	AIR	12"	MAX
	COMBUSTIONOFFRONT IN.3LEASTATBESHALL			IN.
		1 SQ
		PER 1000
		BTUH* IN DOOR
		OR WALL
INTERIOR		UNCONFINED
		SPACE
HEATED
SPACE
		6" MIN
	CLEARANCEIN OPENINGS	(FRONT)†			312A
		1 SQ IN.
		PER 1000
		BTUH* IN DOOR
		OR WALL
				12" MAX

CIRCULATING AIR DUCTS	DUCT	1 SQ IN.
	TO	PER 4000
	OUTDOORS	BTUH*

*Minimum dimensions of 3 in.

NOTE: Use any of the following combinations of openings:

A & B C & D D & E F & G

A03174

Fig. 7 - Air for Combustion, Ventilation and Dilution for

Outdoors

The opening shall commence within 12 in. (300 mm) of the ceiling. Appliances in the space shall have clearances of at least 1 in. (25 mm) from the sides and back and 6 in. (150 mm) from the front. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

Indoor Combustion AirE NFPA & AGA Standard and Known-Air-Infiltration Rate Methods

Indoor air is permitted for combustion, ventilation, and dilution, if the Standard or Known-Air-InfiltrationMethod is used.

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in death and/or personal injury.

Many homes require air to be supplied from outdoors for furnace combustion, ventilation, and dilution of flue gases. The furnace combustion air supply must be provided in accordance with this instruction manual.

CIRCULATING AIR DUCTS

*Minimum opening size is 100 sq in. with minimum dimensions of 3 in.

†Minimum of 3 in.. when type-B1 vent is used.

A03175

Fig. 8 - Air for Combustion, Ventilation, and Dilution from

Indoors

The Standard Method:

1.The space has no less volume than 50 cubic feet per 1,000 Btuh of the maximum input ratings for all gas appliances installed in the space and

2.The air infiltration rate is not known to be less than 0.40 air changes per hour (ACH).

The Known Air Infiltration Rate Method shall be used, if the infiltration rate is known to be:

1.Less than 0.40 ACH and

2.Equal to or greater than 0.10 ACH

Infiltration rates greater than 0.60 ACH shall not be used. The minimum required volume of the space varies with the number of ACH and shall be determined per Table 3 or Equations 1 and 2. Determine the minimum required volume for each appliance in the space and add the volumes together to get the total minimum required volume for the space.

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