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Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and
Combustion Air
in Canada, in accordance with NSCNGPIC.
• 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.
All manuals and user guides at all-guides.com
250mm (10")
500mm (20")
500mm (20")
250mm (10")
Openings supplying indoor air
15
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