Plumbing vents (a network of pipes that carry ... to ensure the vent can never be flooded. The other uses a mechanical vent known variously as an air admittance valve (AAV), Studor valve or ...

MCAA, NECA, and SMACNA joined forces January 27-30 to drive progress in the MEP industry. LOS ANGELES, CA — Mechanical, electrical and plumbing experts from around the industry and around the world ...