3.5.6 Rooftop vent termination
Warning
Condensate can cause corrosion of metal roofing components and other roofing materials.
Check with the builder or roofing contractor to ensure that materials are resistant to acidic
condensate. pH levels can be as low as 3.0.
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 10 Rooftop vent terminal
configurations
Figure 11 Rooftop vent termination with
sidewall combustion air
3.5.6 Rooftop vent termination
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