The Ontario Building Code | Lengths for other Vent Pipes
7.5.8.5. Lengths for other vent pipes
(1) When sizing an additional circuit vent, offset relief vent, relief vent,yoke vent and the vent pipe for an interceptor, dilution tank, sanitary sewage tank or sump, or manhole, length is not taken into consideration.
7.5.9. Air Admittance Valves
In Plain Language
This article sets length limits for other vent pipes not specifically covered elsewhere, since a vent run that's too long can lose its effectiveness at protecting trap seals.
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.