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