Like I said, I believe your #1 meets code. Maybe we'll get some experienced plumbers to offer their input.Thanks voletl and Diehard, unfortunately I don't have room for the separate floor vent and drain pipe, that's why I was wondering if any of my three configurations met code. Perhaps I can get by with the AAV.
There are pictures on exactly how to pipe it to code.... here I'll post another oneRather than scaring the OP about the possible failure of AAV's why not advise as to how he may pipe it to code?
"Air Admittance Valves have been effectively used in Europe for more than four decades and they have been used in mobile and manufacturer homes in the USA for the last thirty years or more. U.S. manufacturers offer warranties that range from 20 years to lifetime. AAV’s are also IAPMO approved."
I'd venture to say that most plumbers have never seen an AAV fail in the open position allowing gas to escape. Although, I have seen mine that failed to open and had to be replaced.