![]() All vent and branch vent pipes shall be installed so as to drain back to the soil or waste pipe. Changes in size or diameter of vent terminals shall be made by the installation of an increaser commencing at least 1 foot below the roof. Each vent extension through the roof shall be a minimum of 3 inches in diameter and no smaller than the vent that it terminates. Vent terminals shall not be used for the purpose of supporting flag poles, television aerials, or similar purposes. Wet vents located within an exterior wall or in a wall adjacent to an unheated space shall be protected from freezing. No soil, waste or vent pipe extension (except for vent terminals as provided in subsections (b) and (d) of this Section() shall be located on the outside of a wall of any building, but shall be installed inside the building. ![]() No vent terminal from a drainage system shall be directly beneath a door, window, overhang or other ventilating intake opening of the building, nor shall any vent terminals be within 12 feet horizontally of an opening or within 4 feet of a vertical obstruction unless it is at least 2 feet above the top of the opening. Each vent terminal shall be made water-tight with the roof by proper flashing. If a roof is to be used for any purpose other than weather protection, the vent shall be extended at least 7 feet above the roof. Extensions of vent pipes through a roof shall be terminated at least 12 inches above the roof unless a roof is to be used for any purpose other than weather protection. Vents shall terminate independently above the roof to the outside atmosphere or shall be connected to another vent at least 6 inches above the flood-level rim of the highest fixture served by the vent. (See Appendix A.Table K and Appendix K.Illustration C.) Each building in which plumbing is installed shall have at least one main vent no smaller than 3 inches for each building drain installed. A stack vent or vent stack shall be installed with a soil or waste stack whenever vents, relief vents or other branch vents are required. Fixture traps shall be protected by the appropriate method as follows: an individual dry vent, a wet vent, a common vent, a circuit or loop vent, an island vent, or a combination waste and vent system. All fixture traps shall be protected by the use of a vent or venting system constructed in accordance with this Part. ![]() The venting system shall be designed and installed to permit the admission or emission of air so that under normal and intended use the seal of any fixture trap shall never be subjected to a pneumatic pressure differential of more than a 1-inch water column. A properly designed and installed venting system, in conjunction with the soil or waste system, is essential to protect trap seals and prevent siphonage, aspiration, or back pressure. ![]()
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