The Ontario Building Code | Mechanical Ventilation for Dwelling Units
9.32.1.2. Mechanical ventilation for Dwelling Units
(1) Everydwelling unit that is supplied with electrical power shall be provided with a mechanical ventilation system in accordance with Subsection 9.32.3.
In Plain Language
Mechanical ventilation is required for dwelling units under the conditions set out in this article, ensuring adequate fresh air exchange regardless of window use.
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.