COMBUSTION AND VENTILATION AIR
ALLCOMBUSTIONAIR FROM ADJACENT INDOOR SPACES THROUGH INDOOR COMBUSTION AIROPENINGS
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Opening
FIGUREA
ALL COMBUSTION AIR FROM OUTDOORS. INLET AIR FROM VENTILATED CRAWLSPACEAND OUTLETAIR TO VENTILATEDATTIC.
UL Listed Vent Cap
UL Listed Gas Vent
Ventilation Louvers
(each end of attic)
Outlet Air
Inlet Air
Ventilation
louvers for unheated crawl space
FIGURE B
ALL COMBUSTION AIR FROM OUTDOORS
THROUGHVENTILATEDATTIC
UL Listed Vent Cap
UL Listed Gas Vent
| Ventilation Louvers | |
| (each end of attic) | |
Inlet | Outlet Air | |
Grille | ||
| ||
Inlet | Inlet Air Duct | |
(Ends 1 ft. [300mm] above floor) | ||
Grille |
|
FIGURE C
ALL COMBUSTION AIR FROM OUTDOORS
THROUGHSINGLECOMBUSTIONAIROPENING
UL Listed Vent Cap
UL Listed Gas Vent
Opening
Alternate
Opening
Location
FIGURE D
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