7.5.7.4.Offset Relief Vents

(1) Except as provided in Article 7.5.7.1., the minimum nominal pipe size of an offset relief vent is permitted to be one
  NPS smaller than the NPS of the stack vent..

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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.