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Thanks all for the replies. As I was filling a Homer bucket with all the fittings, I ran into a trusted plumbing guy, and he talked me into an AAV. He said the inspectors here even favor them. I bought the only one they carry-- the Oatey 39016. Any thoughts about this one (is a Studor better)...

Also, are those Ts at the very bottom wye Ts? I assume the 45 part of it should be at 12:00 orientation when I use a street 45 to get to the vent.

Thank you so much for your reply. I think I know what you mean. But what about the pitch in the horizontal vent line? How important is it that it run downhill (vs. level) towards the sink since it is then going straight up anyway.

Hi all. I've read a few threads on the subject and have a question not covered in those threads. Even though AAVs are allowed here, I'm doing this from scratch so I'd rather do it the better way, assuming this is better. Going by this common diagram... My floor joists run the other...