Combustion Air | Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and | |
in Canada, in accordance with NSCNGPIC. | ||
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•Provide two permanent openings to allow circulation of combustion air.
•Make each opening 199 square inches if they provide indoor air, and 100 square inches for outdoor air.
•If the unit is installed in a mechanical closet, provide a 600mm (24") clearance in front of the unit to the door.
•If combustion air will be provided through a duct, size the duct to provide 60 cubic feet of fresh air per minute.
250mm (10")
500mm (20")
500mm (20")
250mm (10")
Openings supplying indoor air
15
