Vent screen retainer
Exhaust
Vent screen
Inlet
Flashing
Figure 18 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.
For roof top venting of multiple boiler sets, group all intake terminals together for a
common penetration through a custom cap. Alternatively, place close together using
commonly available pipe flashing. Similarly, group the exhaust pipes and place the
two separate groups of pipes at least 3' apart (the closest intake and exhaust pipes
must be 36", or more, apart). Use the same 12" (minimum) vertical separation for all
termination options. For alternate group terminations, contact the IBC factory for
written guidance.
3.7.5 Rooftop vent termination
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