The Ontario Building Code | Steel Door Frames
9.10.13.6. Steel door Frames
(1) Steel door frames forming part of a closure in a fire separation, including anchorage requirements, shall conform to CAN/ulc-S105, "Fire door Frames Meeting the Performance Required by CAN/ULC-S104".
In Plain Language
Steel door frames used with fire-rated doors must meet the requirements set out in this article, ensuring the frame doesn't undermine the door's fire performance.
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.