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Discussion Starter · #1 ·
I have a question about Air Admittance Valves. My understanding is that, if I use an AAV, I still need at least one conventional vent to the roof.

Just wondering why this is. I realize it's required, but what happens if the conventional vent is absent?

Thanks
Eric
 

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the Musigician
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10,404 Posts
Pressure. If all you had was AAVs, the pressure has nowhere to escape to.

DM
 
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