Robert Jones Posted November 21, 2014 Report Share Posted November 21, 2014 First time for me in not locating a main sewer stack in a home. There are AAV's at the drain(s) in the crawl space. Is this allowed? Click to Enlarge 60.65 KB Quote Link to comment Share on other sites More sharing options...
mjr6550 Posted November 21, 2014 Report Share Posted November 21, 2014 Are they real AAVs or mechanical vents? AAVs are permitted, but IRC still requires one minimum 3" vent stack through the roof. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted November 21, 2014 Report Share Posted November 21, 2014 Those really look like cheater vents to me, not AAVs. AAVs can be used if there is one main vent stack open to the exterior. AAVs should be a minimum of 4" above each of the horizontal branch drains or fixture drains being vented. Click to Enlarge 15.51 KB Quote Link to comment Share on other sites More sharing options...
Robert Jones Posted November 21, 2014 Author Report Share Posted November 21, 2014 Thanks Bill. Can you educate me on the use of these cheater vents? I did see one small stack above the kitchen sink(through the roof). Small galvanized type vent pipe. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted November 21, 2014 Report Share Posted November 21, 2014 Robert, Read this: Vent Quote Link to comment Share on other sites More sharing options...
Robert Jones Posted November 21, 2014 Author Report Share Posted November 21, 2014 Thanks Brandon. Quote Link to comment Share on other sites More sharing options...
mjr6550 Posted November 22, 2014 Report Share Posted November 22, 2014 Thanks Bill. Can you educate me on the use of these cheater vents? I did see one small stack above the kitchen sink(through the roof). Small galvanized type vent pipe. The "cheater vents" are only approved for manufactured homes or RVs. Quote Link to comment Share on other sites More sharing options...
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