7.5.7.2.Size Restriction

(1) The nominal pipe size of a branch vent, stack vent, vent stack or vent header shall be not less than the nominal pipe
  size of the vent pipe to which it is connected.

  (2) Sanitary building drains shall be provided with at least one vent that is not less than NPS 3.

  (3) A vent referred to in Sentence (2) shall be a soil stack if one is available and may be a vent stack or waste stack that
  provides at least NPS 3 stack vent and that goes to open air above the roof, either directly or through a header.

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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.