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Alternate Horizontal Vent Termination- PVC, CPVC or PP Material
(When 3 ft (0.9 m) distance between Intake and Exhaust cannot be ensured.)
WARNING
• If the distance between the air inlet and exhaust vent terminations is too short, the Combi Boiler will
draw in the exhaust gases through the intake. There is a risk of inadequate combustion air for the Combi
Boiler, thus increasing Carbon Monoxide (CO) emissions and noise due to vibration.
• Termination elbows must be oriented vertically, pointing directly downward. Attempts to prevent exhaust
air from entering the air inlet by angling termination elbows in directions other than directly downward
will increase the risk of freezing.
• Reversing the air intake and exhaust pipes is not allowed. Carbon Monoxide (CO) emissions and noise
due to vibration will increase.
• Insert the bird screen into the 90° elbow installed vertically downward.
• Intake and exhaust should face the same direction. Intake and exhaust should keep the same pressure zone.
NOTE Do not use Hood termination.
Interior View
Interior View
Interior View
28
Venting the Combi Boiler
Exterior View
Exhaust
≥ 3 in. Min.
( between outside
wall and
termination)
Exterior View
≥ 3 in. Min.
( between outside
wall and
termina on)
Exterior View
Intake
Exhaust
≥ 3 in. Min.
( between outside
wall and
termina on)
Intake
≥ 2 ft Min.
The distance is measured
at inside of pipe to inner
dimension.
Exhaust
NOTE
Upper side is exhaust, lower
Intake
side is intake. The reverse
orientation is not allowed.
≥ 1 Min.
The distance is measured
at the outlets of intake
port (terminal) and
exhaust port (terminal).
NOTE
The side distant from wall is
intake, the side near the
wall is exhaust.
The reverse orientation is
not allowed.
≥ 1 Min.
The distance is measured
at inside of pipe to inner
dimension.
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