part illinois plumbing code The General Assembly’s Illinois Administrative Code database includes only those rulemakings that have been permanently adopted. To be legal, an air admittance valve must conform to standards established by the International Association of Plumbing and Mechanical Officials (ASSE) in Author: Chris Deziel. You can extend the vent stack into the attic, and if you do, the distance between the AAV and the attic floor must be at least 6 inches.This CodeNotes - Installation of Air Admittance Valves [based on the International Plumbing Code (IPC) and International. Air admittance valves are devices that were created to solve a problem with the conventional open pipe venting design and can serve as a vent for drainage waste and vent systems in lieu of open pipe vents. Illinois plumbing code air admittance valve installation
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