VENTILATION AIR FROM OUTDOORS
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent
openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly
to the outdoors. These spaces include attics and crawl spaces. Follow the National Fuel Gas Code
NFPA 54/ANSI Z223.1, Section 5.3, “Air For Combustion and Ventilation” for required size of
ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet air into attic if attic has a
thermostat-controlled power vent. Heated air entering the attic will activate the power
unit.
WARNING
THIS APPLIANCE MUST HAVE FRESH AIR FOR PROPER OPERATION. IF NOT,
POOR FUEL COMBUSTION COULD RESULT. READ THE FOLLOWING
INSTRUCTIONS TO ENSURE PROPER FRESH AIR FOR THIS AND OTHER FUEL-
BURNING APPLIANCES IN YOUR HOME.
Figure 14 - Ventilation Air From Outdoors
Ventilated Attic
Outlet Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Outlet Air
Inlet Air
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