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Fig. 40—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
Fig. 38—Concentric Vent and Combustion-Air Roof
Termination (Preferred)
A93054
COMBUSTION
AIR
MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
VENT
Fig. 41—Sidewall Termination of Less than 12 in.
A87226
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
COUPLING
12″ MINIMUM
OVERHANG OR ROOF
COMBUSTION-AIR
(ELBOW PARALLEL
TO WALL)
Fig. 39—Concentric Vent and Combustion-Air Side
Termination
A93055
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
COMBUSTION-AIR
VENT
1″ MAXIMUM
12″ MINIMUM
OVERHANG OR ROOF
Fig. 37—Roof Termination (Preferred)
A87224
18″ MAXIMUM
COMBUSTION
AIR
COUPLING
ROOF
VENT
BRACKET
VERTICAL SEPARATION
BETWEEN COMBUSTION
AIR AND VENT
8
3
/
4
″ FOR 3″ KIT
6
3
/
4
″ FOR 2″ KIT
MAINTAIN 12 IN. MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24 IN. ABOVE ROOF.
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