The provisions of this chapter shall govern the materials, design, construction and installation of vent systems.

    901.2Trap seal protection.

    The plumbing system shall be provided with a system of vent piping that will permit the admission or emission of air so that the seal of any fixture trap shall not be subjected to a pressure differential of more than 1 inch of water column (249 Pa).

    901.2.1 Venting required.

    Traps and trapped fixtures shall be vented in accordance with one of the venting methods specified in this chapter.

    901.3Chemical waste vent systems.

    The vent system for a chemical waste system shall be independent of the sanitary vent system and shall terminate separately through the roof to the outdoors or to an air admittance valve that complies with ASSE 1049. Air admittance valves for chemical waste systems shall be constructed of materials approved in accordance with Section 702.5 and shall be tested for chemical resistance in accordance with ASTM F 1412.

    901.4Use limitations.

    The plumbing vent system shall not be utilized for purposes other than the venting of the plumbing system.


    The vent system shall be tested in accordance with Section 312.

    901.6Engineered systems.

    Engineered venting systems shall conform to the provisions of Section 919.