Carrier 58CTA/CTX instruction manual Air for Combustion, Ventilation, and Dilution for Outdoors

					1 SQ IN.
		DUCTS			PER 4000
					BTUH*
		TO
	OUTDOORS
(305mm) 12″ MAX				D	12″	(305mm)
1 SQ IN.		CIRCULATING	AIR DUCTS	VENT	MAX
PER 2000	B			THROUGH	F
BTUH*				ROOF	1 SQ IN.
					PER
					4000
					BTUH*
DUCTS		CLEARANCE IN FRONT	OF COMBUSTION AIR OPENINGS SHALL BE AT LEAST 3 IN.		OUTDOORS
TO
OUTDOORS
					1 SQ IN.
					PER
					4000
1 SQ IN.					BTUH*
				E	G
PER 2000	A
BTUH*				(76mm)	12″	(305mm)
(305mm) 12″ MAX				C	MAX
				12″ MAX
				(305mm)
CIRCULATING AIR DUCTS				DUCT	1 SQ IN.
				TO	PER 4000
				OUTDOORS	BTUH*
*Minimum dimensions of 3---in. (76 mm).
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		VENT THROUGH ROOF
	DUCTS
		AIR
			12"	MAX (305mm)
		COMBUSTIONOFFRONT IN.3LEASTATBESHALL			IN.
			1 SQ
			PER 1000
			BTUH* IN DOOR
			OR WALL
INTERIOR			UNCONFINED
			SPACE
HEATED
SPACE
			6" MIN (152mm)
		CLEARANCEIN OPENINGS	(FRONT)Ü			58CT
			1 SQ IN.
			PER 1000
			BTUH* IN DOOR
			OR WALL
					12" MAX (305mm)
CIRCULATING AIR DUCTS

*Minimum opening size is 100 sq in. (64516 sq. mm) with minimum dimensions of 3 in. (76 mm)

† Minimum of 3 in. (76 mm) 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.

9