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Combustion Air
• Provide two permanent openings to allow
circulation of combustion air.
• Make each opening 250 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 90 cubic feet of
fresh air per minute.
Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and
in Canada, in accordance with NSCNGPIC.
375mm (15")
500mm (20")
500mm (20")
375mm (15")
Openings supplying indoor air
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