7.5.7.1.General

(1) The nominal pipe size of every vent pipe shall conform to Table 7.5.7.1.

                                                         Table 7.5.7.1.
                                Minimum Permitted Size of Vent Pipe Based on Size of Trap Served
                                       Forming Part of Sentences 2.5.7.1.(1) and 2.5.8.2.(1)

                        Nominal Pipe Size of Trap Served, NPS      Minimum Nominal Pipe Size of Vent Pipe, NPS
                                         1¼                                             1¼
                                         1½                                             1¼
                                          2                                             1½
                                          3                                             1½
                                          4                                             1½
                                          5                                             2
                                          6                                             2

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.