"Can I safely use an air admittance valve (or "auto vent") on any of the above systems?"
Although some people have installed an air admittance valve on the above systems, we will never
suggest or recommend that you do so. We always recommend installing a vent all the way to the roof
(and as per your local codes). We have had people write us stating that when they installed an
air admittance valve the flapper in the valve can chatter and create vibration. The right way to
go is to install a non-mechanical vent, all the way to the roof, and as per your local codes.
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