7.5.8.1.Hydraulic Loads Draining to Wet Vents

(1) The hydraulic load that drains to a wet vent shall conform to Table 7.5.8.1.

     (2) When determining the nominal pipe size of a wet vent, the hydraulic load from the most downstream fixture or
     symmetrically connected fixtures shall not be included.

                                                          Table 7.5.8.1.
                                    Maximum Permitted Hydraulic Loads Drained to a Wet Vent
                                        Forming Part of Sentences 7.5.7.3.(2) and 7.5.8.1.(1)

                                                                      Maximum Hydraulic Load, Fixture Units
     Nominal Pipe Size of Wet Vent, NPS                                                   Fixtures, Other Than Water Closets, That
                                                     Not Serving Water Closets
                                                                                           Serve Not More Than 2 Water Closets
                     1½                                          2                                            n/a
                      2                                          4                                             3
                      3                                         12                                             8
                      4                                         36                                            14
                      5                                         n/a                                           18
                      6                                         n/a                                           23

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.