24
SECTION X
AIR FOR COMBUSTION AND VENTILATION OUTDOORS
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one
within 12" of ceiling and one within 12" of floor. Connect these items directly to outdoors. These spaces
include attics and crawl spaces. Follow 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.
Ventilated Attic
Outlet Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Outlet Air
Inlet Air
Ventilation Air From Outdoors
Содержание AGVF340
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