Studor Air Admittance valve

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FLForester

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I purchased a Studor Maxi vent air admittance valve (for 3 & 4 inch pipes) as the stack appeared to be a 3 inch one. Once I got deep into the attic, I was surprised to find it was 2 inches. May I use the Maxi vent with an adapter or must I purchase the Mini Vent for 2 inch pipes?
 

FLForester

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Florida code P3114.7 states "a minimum of one stack vent or a vent stack shall extend out doors to the open air." I am eliminating just one as it interferes with solar panels. I wanted to make sure that although a larger size, it was still OK to adapt the Maxi-vent and it would function properly. I did not want to "assume" anything.
 

Mitchell-DIY-Guy

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Florida code P3114.7 states "a minimum of one stack vent or a vent stack shall extend out doors to the open air." I am eliminating just one as it interferes with solar panels. I wanted to make sure that although a larger size, it was still OK to adapt the Maxi-vent and it would function properly. I did not want to "assume" anything.
Makes perfect sense. My builder in Michigan, in 1992, had a thing about roof penetrations and appearance from the street. Thus, all plumbing vents went to the attic, and were tied together to a single vent through the roof. All bathroom fans vented through soffits. All attic vents were on the back side of the house and not visible from the street.
 

MrInfoPhilly

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Florida code P3114.7 states "a minimum of one stack vent or a vent stack shall extend out doors to the open air." I am eliminating just one as it interferes with solar panels. I wanted to make sure that although a larger size, it was still OK to adapt the Maxi-vent and it would function properly. I did not want to "assume" anything.
Yes, vents are allowed to be Upsized., and it can only help., not hurt the plumbing system!
 
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