Vent screen retainer
Exhaust
Vent screen
Inlet
Flashing
Figure 10 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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