The Ontario Building Code | Ducts in Exits
6.2.3.10. Ducts in Exits
(1) Except as permitted in Sentence (2), duct penetration of fire separations separating exits from the remainder of the building shall be in accordance with Article 3.4.4.4.
(2) Duct penetration of fire separations separating exits from the remainder of the buildingis permitted if the duct,
(a) is designed for the purposes of Subsection 3.2.6., or
(b) only serves the exit from a dedicated rooftop air make-up unit.
In Plain Language
Except in a specific permitted case, duct penetration of fire separations that separate exits from the rest of the building must follow the general fire-separation penetration rules in Article 3.4.4.4.
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.