Question: are air admittance valves legal in minnesota?
Answer: Minnesota Plumbing Code requirements Our old home-grown plumbing code used to specifically prohibit the use of air admittance valves (AAVs), but the new plumbing code that was adopted in 2016 is silent on the matter, which means the same thing. AAVs aren't allowed. ... At any rate, they're not legal here in Minnesota.