Combustion Air Requirements - Bosch 660 EF User Manual

3.4

Combustion air requirements

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.
• Provide two permanent openings to allow circulation
of combustion air.
• Make each opening 180 square inches if they pro-
vide indoor air, and 100 square inches for outdoor
air.
• If the unit is installed in a mechanical closet, provide
a 24" (600mm) 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.
Fig. 13
6 720 644 063
Installation instructions
15