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ALL COMBUSTION AIR FROM OUTDOORS
THROUGH SINGLE COMBUSTION AIR OPENING
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Alternate
Opening
Location
FIGURE D
ALL COMBUSTION AIR FROM OUTDOORS
THROUGH VENTILATED ATTIC
UL Listed Vent Cap
UL Listed Gas Vent
Inlet
Grille
Inlet
Grille
Ventilation Louvers
(each end of attic)
Outlet Air
Inlet Air Duct
(Ends 1 ft. [300mm] above floor)
FIGURE C
FIGURE B
ALL COMBUSTION AIR FROM
OUTDOORS. INLET AIR FROM
VENTILATED CRAWL SPACE AND
OUTLET AIR TO VENTILATED ATTIC.
UL Listed Vent Cap
UL Listed Gas Vent
Ventilation Louvers
(each end of attic)
Outlet Air
Inlet Air
Ventilation
louvers for unheated
crawl space
Page 5
ALL COMBUSTION AIR FROM
ADJACENT INDOOR SPACES
THROUGH INDOOR COMBUSTION
AIR OPENINGS
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Opening
FIGURE A
COMBUSTION AND VENTILATION AIR