AAV problem?

Anyone else have a problem with using a 2" AAV on the 4" vent for a commercial self-serve and full sevice “laundromat” servicing 30 washing machines?

Is there a 4" AAV that anyone is aware of?

I’m writing the report, now.

They do make 4" aav’s.

Here are some.


Hi to all,

Barry, I would see that in the same light as any other reduction in vent diameter, and as such improper



Thank you both for the leg-work and timely replies.

Saved the day!