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Combustion Air/Vent Pipe Requirements
Boiler requires dedicated direct vent system. Direct vent
system, all air for combustion is taken directly from outside
atmosphere, and all flue products are discharged to outside
atmosphere.
Combustion air and vent pipe connections must terminate
together in same atmospheric pressure zone, either
through roof or sidewall (roof termination preferred). See
Figures 8 and 9 for required clearances.
Venting must be as direct as possible and properly
supported.
Figure 9
- Multiple Boiler Roof Vent/Intake
Terminations
12" (305mm)
Minimum
8" (203mm)
Minimum
Vent
12" (305mm)
Minimum Above
Anticipated Snow Line
Figure 11 - Concentric Vent Terminations
1" (26mm)
Maximum
Combustion Air
6 - COMBUSTION AIR/ VENT REQUIREMENTS
3" (76mm)
Minimum
15" (381mm)
Maximum
Combustion
Air
Single Boiler
Application
Vent
Maintain 12"(305mm)
Clearance Above Highest
Anticipated Snow Level
or Grade
Canada see page 19
Figure 10 - Sidewall Vent/Intake Terminations
12" (305mm)
Minimum From
g
Overhan
See Snow &
Ice Page 19
• Avoid locations where
snow may drift and block
vent and combustion air.
• Ice or snow may cause
boiler to shut down if
vent or combustion air
becomes obstructed.
Combustion Air
If concentric vent termination is being used, refer to
Figure 10 for proper setup.
* See Note
Below
Combustion Air
*Must be less than 4" or greater than 24" Horizontal distance
between end bells of each air intake to prevent flue gas recirculation.
15
Single Boiler
Application
3" (76mm)
Minimum
Separation
12" (305mm) Separation
Between Bottom of
Combustion Air Intake
And Bottom of Vent
Vent
Combustion Air
Multiple Boiler
Application
12" (305mm)
Minimum
Separation
Vent
Multiple Boiler
Overhang
Application
12" (305mm) Minimum
36"(0.9m) Minimum
Maintain 12"
clearance above
Vent
highest anticipated
snow level or grade
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