Vent screen retainer
Exhaust
Vent screen
Inlet
Flashing
Figure 15 Rooftop vent terminal vent screen and retainer
The intake air pipe is not typically drained, so it must be terminated with a down-
turned elbow as shown.
The intake pipe does not need to penetrate the roof at the same elevation as the
exhaust (as shown); lower down on the roof is acceptable.
Best Practice: To reduce the possibility of expansion noise, allow a ¼"
gap around the exhaust and air intake piping.
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