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VII. Venting (continued)
Vent
12 in. min.
Above Snow Line
Figure 9: Horizontal Sidewall Termination
6 Pipe Diameters Min.
Bird Screen
Vent & Intake
24 in. Min.
Above Intake
12 in. Min.
Above Roof/Snow Line
Figure 11: Flat Roof Vent Terminations
Notes:
1. All terminations must have bird/rodent screens.
2. If Possible, Install Sidewall venting on a wall away from prevailing wind.
3. For roof terminations, install vent terminal downstream of prevailing winds relative to intake terminal.
4. It is recommended to use tee terminations with a vertical run in extra windy areas.
Installing multiple vent terminations too close together may result in combustion product water vapor conden-
sation on building surfaces where vent terminations are placed, causing subsequent frost damage. To avoid/
minimize frost damage, extend the distance from building surfaces to vent termination end and increase the
horizontal distance between adjacent vent terminations
26
Bird Screen
Vent & Intake
4 Pipe Diameters min.
Combustion
Air
Grade/Snow Line
24 in. Min.
From Parapet
CAUTION
Bird Screen
Vent & Intake
Vent
Figure 10: Slopped Roof Termination
24 in. Min.
From Parapet
Above Parapet
CAUTION
.
6 Pipe Diameters Min.
24 in. Min.
From Intake
12 in. Min.
Above Snow Line
Combustion
Air
WARNING
WARNING
The required spacing between vent
and combustion air terminals is
to prevent flue gas recirculation.
Recirculation of flue gas products
into the combustion air supply can
cause damage to property or the
appliance.
AMP 400-1000L I&O Manual
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