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Fig. 40—Concentric Vent and Combustion-Air RoofTermination (Preferred)
A93054
COMBUSTION
AIR
MAINTAIN 12 IN. (305 mm).
(18 IN. (457 mm) FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. (610 mm) ABOVE ROOF.
VENT
Fig. 41—Concentric Vent and Combustion-Air SideTermination
A93055
MAINTAIN 12 IN. (305 mm)
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
COMBUSTION-AIR
VENT
1″ MAXIMUM
12″ (305 mm) MINIMUM
OVERHANG OR ROOF
Fig. 42—Sidewall Termination of 12 in. or More
A87225
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
90¡
VENT
12 IN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT
BRACKET
COMBUSTION-AIR
12″ MINIMUM
OVERHANG OR ROOF
—38—