Vent Terminals

Section 890 Section 890.1430  Vent Terminals a)         Vent Terminals. 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 K.Illustration B.) b)         Roof Extensions.  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.  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.  (See Appendix K.Illustration D.) c)         Flashings.  Each vent terminal shall be made water-tight with the roof by proper flashing. d)         Location of Vent Terminal.  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.  (See Appendix K.Illustration E.) e)         Extensions Outside Building.  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.  Wet vents located within an exterior wall or in a wall adjacent to an unheated space shall be protected from freezing. f)         Flag poles.  Vent terminals shall not be used for the purpose of supporting flag poles, television aerials, or similar purposes. g)         Vent Terminal Size.  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 screened. h)         Increasers. 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.