lcf02139
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No. The purpose of the Air Admittance Valve (AAV) is to provide "air behind water" so drains can operate properly. In many cases, a new roof penetration is not practical, so AAVs are allowed by code.
However, your system needs a roof vented stack too. So, you can't build a house with zero stack vents. Every drain needs a trap and every trap needs a vent, with roof penetration or AAV. In your case, these look like branch vents. Individual and branch AAVs need to be at least four inches above horizontal drains. Stack type AAVs need to be installed a minimum of six inches above the flood level of the highest fixture being served. AAVs must be accessible in the rare case they fail. AAVs in attics should be at least six inches above the attic insulation.
No. The purpose of the Air Admittance Valve (AAV) is to provide "air behind water" so drains can operate properly. In many cases, a new roof penetration is not practical, so AAVs are allowed by code.
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