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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
VENTILATED ATTIC.
FIG. 4-D
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Opening
UL Listed Vent Cap
UL Listed Gas Vent
Ventilation
Outlet Air
Ventilation Louvers
(each end of attic)
Inlet Air
FIG. 4-A FIG. 4-B