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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 4.3, "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.
THIS HEATER 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.
Ventilated Attic
Outlet Air
Outlet Air
Inlet Air
Inlet Air
Figure 7
Ventilation Air From Outdoors
WARNING
To Attic
To
Crawl
Space
Ventilated
Crawl Space
16
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