Table a Minimum Recommended Combustion AIR Supply

Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. Table A lists the requirements for the appliance only, additional gas fired appliances located in the same room will require an increase in the net free area to supply adequate combustion air for all appliances. Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada refer to National Standard CAN B149.1 or B149.2. Check all local code requirements for combustion air.

All dimensions are based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening a minimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers. Where two openings are provided, one must be within 12" (30 cm) of the ceiling and one must be within 12" (30 cm) of the floor of the room where the appliance is installed. Each opening must have a net free area as specified in Table A. Single openings shall be located within 12" (30 cm) of the ceiling.

CAUTION

Under no circumstances should the room where the appliance is installed ever be under a negative pressure. Particular care should be taken where exhaust fans, attic fans, clothes dryers, compressors, air handling units, etc., may take away air from the appliance.

The combustion air supply must be completely free of any flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance. Common corrosive chemical fumes which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as freon, tricholorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the heat exchanger finned tubes, headers, flue collectors, and the vent system. The result is improper combustion and a non-warrantable, premature appliance failure.

TABLE - A

MINIMUM RECOMMENDED COMBUSTION AIR SUPPLY

		Combustion Air Source
	Input	Outside Air/2	Outside Air/1	Inside Air/2
	Btu/hr	Openings	Opening	Openings

45,000		12 in2	15 in2	100 in2
75,000		19 in2	25 in2	100 in2
90,000		23 in2	30 in2	100 in2
135,000		34 in2	45 in2	135 in2
180,000		45 in2	60 in2	180 in2
199,999		50 in2	67 in2	200 in2
215,000		55 in2	74 in2	224 in2
225,000		56 in2	75 in2	225 in2
260,000		67 in2	89 in2	269 in2
270,000		68 in2	90 in2	270 in2
315,000		79 in2	105 in2	315 in2
360,000		90 in2	120 in2	360 in2

399,999		100 in2	133 in2	400 in2

500,000		125 in2	167 in2	500 in2

000 Btu/hr, 000 - 500, RSB-i&s-05, 45, CP-5M-4/08 specifications

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