| ROOF | 18″ MAXIMUM |
|
| |
|
| BRACKET |
| COUPLING |
|
|
| COMBUSTION |
VERTICAL SEPARATION |
| AIR |
VENT |
| |
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. |
|
|
Fig. 30ÐRoof Termination (Preferred)
VENT
COMBUSTION
AIR
MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
A93054
A87224
OVERHANG OR ROOF
12″ MINIMUM
1″ MAXIMUM
VENT
MAINTAIN 12 IN.
CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER.
A93055
Fig. 31ÐConcentric Vent and Combustion-Air Roof
Termination (Preferred)
OVERHANG OR ROOF
12″ MINIMUM
VENT 
90° 
BRACKET
12 IN. SEPARATION
BETWEEN BOTTOM OF COMBUSTION AIR AND
BOTTOM OF VENT
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST ANTICIPATED SNOW
LEVEL OR GRADE,
A87225
Fig. 33ÐSidewall Termination of 12 in. or More
Fig. 32ÐConcentric Vent and Combustion-Air Side
Termination
OVERHANG OR ROOF
12″ MINIMUM
VENT 
90° 
BRACKET
COUPLING
| 12 IN. SEPARATION |
| BETWEEN BOTTOM OF |
| COMBUSTION AIR AND |
| BOTTOM OF VENT |
| MAINTAIN 12 IN. |
| CLEARANCE |
| ABOVE HIGHEST |
| ANTICIPATED SNOW |
LEVEL OR GRADE, | |
(ELBOW PARALLEL | WHICHEVER IS |
TO WALL) | GREATER. |
| A87226 |
Fig. 34ÐSidewall Termination of Less than 12 in.
Ð28Ð
