Noritz N-084M-CA Owner's Manual And Installation Manual page 46

Combustion Air
• Provide two permanent openings to allow
circulation of combustion air.
• Make each opening 236 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 607mm(24") clearance in front of the
unit to the door.
• If combustion air will be provided through a
duct, size the duct to provide 86 cubic feet of
fresh air per minute.
46
Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1.
305mm(12")
508mm
(20")
508mm
(20")
305mm(12")
Openings supplying indoor air