Types of Fixture Trap Vents

Section 890 Section 890.1480  Types of Fixture Trap Vents a)         Individual Dry Vent is a single fixture trap vent only and shall not be installed as part of a wet vent. b)         Common Vent.  A vertical common vent may be used for two fixture traps if both traps connect with a vertical waste at the same level.  (See Appendix K.Illustration O.)  A horizontal common vent may be used for two fixture traps if both traps connect to the horizontal waste at the same point and the vent is located downstream of the fixture connection.  The horizontal trap-to-vent distance shall comply with Appendix A.Table I.  (See Appendix K.Illustration O and Appendix A.Table I.) c)         Wet venting shall be installed in accordance with Section 890.1500. d)         Circuit and loop venting shall be installed in accordance with Section 890.1520. e)         Combination waste and vent systems shall be installed in accordance with Section 890.1590. f)         Island vent systems shall be installed in accordance with Section 890.1600.