AAV Shower Question
 

I'm installing a shower into a master bath I'm working on in my attic. The shower is too far from my waste stack and other fixtures to tap into any venting on that end. To vent the shower traditionally is going to be a major problem. My question is whether what I have planned with an AAV would work. I'm looking to run an AAV in a stud wall for a closet (with vent for airflow). I'm in PA and AAVs are allowed by code. I've included a (crappy, approximate, and N.T.S.) diagram with what things look like. My trap for the shower is so far away because there's a raised ceiling just below the shower area for about 4 feet of the run. Thanks!

I'm not a plumber but i don't think you can put an AAV in the wall. Hopefully someone will confirm or disagree with this for sure. I would call you local building inspector and ask him to be sure

Most...Not all, most...Inspectors will allow an AAV in the wall provided that it is accessible and it can breathe. I'll allow it if an HVAC-type louvered grill is used.

That's why I said "(with vent for airflow)". It's in a closet, so I was going to cut a hole in the wall and put a grille there to keep air flowing to it. Still, anyone know if my plans will work?

My question wasn't really pertaining to the AAV in the wall itself, but the AAV's position in the line and whether it would vent properly if run off of that 45 and far away from the trap.

You need your vent line before the p-trap. The way you have it, once the flow of water is past the p-trap, it would have to pull air through the p-trap from your AAV, which would suck your p-trap dry.

Agree with the AAV street side of the trap or the drain water will pull it dry.

can you fit the trap under the shower stall drain? then you can run your AAV the way you want

I had a feeling this was the case. This way surprisingly makes things easier for me. Thanks everyone for all the input!