1018029-A
Page 7
COMBUSTION AND VENTILATION AIR
UL Listed Vent Cap
UL Listed Gas Vent
Ventilation Louvers
(each end of attic)
Outlet Air
Inlet Air Duct
(Ends 1 ft. [300mm]
above floor)
Inlet
Grille
Inlet
Grille
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Alternate
Opening
Location
FIG. 4-C
ALL COMBUSTION AIR
FROM OUTDOORS THROUGH
VENTILATED ATTIC.
FIG. 4-D
ALL COMBUSTION AIR
FROM OUTDOORS THROUGH SINGLE
COMBUSTION AIR OPENING.
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Opening
UL Listed Vent Cap
UL Listed Gas Vent
Ventilation
Louvers for Unheated Crawl Space
Outlet Air
Ventilation Louvers
(each end of attic)
Inlet Air
FIG. 4-A
FIG. 4-B
ALL COMBUSTION AIR FROM
ADJACENT INDOOR SPACES THROUGH
INDOOR COMBUSTION AIR OPENINGS.
ALL COMBUSTION AIR FROM OUTDOORS.
INLET AIR FROM VENTILATED CRAWL SPACE
AND OUTLET AIR TO VENTILATED ATTIC.