TITLE 77: PUBLIC HEALTH
PART 890 ILLINOIS PLUMBING CODE
CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
SECTION 890.1480 TYPES OF FIXTURE TRAP VENTS
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Section 890.1480  Types of Fixture Trap Vents

 

a)         Trap Vent.  No trap vent shall be installed within two pipe diameters of the trap weir.  (See Appendix K:  Illustration N.)

 

b)         Common Vent.  A common vent, installed vertically, may be used for two fixture traps when both traps connect with a vertical waste at the same level.  (See Appendix K:  Illustration O.)

 

c)         Vertical Wet Vent.  A vertical wet vent may be used for two fixtures set on the same floor level, but connecting at different levels in the stack, provided the vertical drain is one (1) pipe diameter larger than the upper fixture drain and that both drains conform to Appendix A:  Table I.  (See Appendix K:  Illustrations P and Q.)

 

d)         Mechanical Vents.  Mechanical devices shall not be installed in lieu of vent piping.