PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.5.7.3.Additional Circuit Vents and Relief Vents
(1) Except as provided in Article 7.5.7.1. and Sentence 7.5.3.1.(7), the minimum nominal pipe size of an additional
circuit vent or relief vent installed in conjunction with a circuit vent is permitted to be one NPS smaller than the required
nominal pipe size of the circuit vent, but need not be larger than NPS 2.
(2) The nominal pipe size of the sanitary drainage pipe acting as a relief vent in accordance with Sentence 7.5.3.1.(4)
shall be in conformance with Table 7.4.10.6.-A, 7.4.10.6.-B or 7.5.8.1., and Article 7.5.7.1., whichever nominal pipe size
is the largest considering the hydraulic load drained into the sanitary drainage pipe.
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
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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.