The Ontario Building Code | Individual Vents and Dual Vents
7.5.8.2. Individual vents and Dual vents
(1) The size of individual vents and dual vents shall be determined using Table 7.5.7.1. according to the largest trapserved.
(2) When sizing an individual vent or a dual vent, the length is not taken into consideration.
In Plain Language
Individual vents (serving one fixture) and dual vents (serving two fixtures back to back) have their own sizing and configuration requirements set out in this article.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.