IBC Sl Series Installation & Operating Manual page 31

a. Rooftop vents must terminate as follows:
The exhaust pipe can terminate in an open vertical orientation without concern
about rain infiltration; rain will drain away through the condensate trap.
Optional bird screen may be placed in a termination fitting. Leave unglued, and hold
in place with a short nipple. This permits easy access for cleaning.
Do not exhaust vent into a common venting system.
b. For rooftop direct vent systems:
Rooftop, two pipe, direct vent configurations, including typical clearance
requirements are shown below in the following images.
Figure 16 Rooftop vent terminal
configurations
3.7.5 Rooftop vent termination
Figure 17 Rooftop vent termination with
sidewall combustion air
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