In Plain Language

A duct that passes through an assembly required to be a fire separation generally must have a fire damper installed, unless one of the exceptions in the next article applies.

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.