7.5.4.5.Fixtures Draining into Vent Pipes

(1) The trap arm of a fixture that has a hydraulic load of not more than 1½ fixture units may be connected to the vertical
  section of a circuit vent, additional circuit vent, offset relief vent or yoke vent, provided
  (a) not more than 2 fixtures are connected to the vent pipe,
  (b) where 2 fixtures are connected to the vent pipe, the connection is made by means of a double sanitary T fitting, and
  (c) the section of the vent pipe that acts as a wet vent is not less than NPS 2.
  (See Note A-7.5.4.5.(1))

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.