The Ontario Building Code | Hold-Open Devices
9.10.13.11. Hold-Open Devices
(1) Where hold-open devices are used on doors in required fire separations, they shall be installed in accordance with Article 3.1.8.12.
In Plain Language
Hold-open devices, which let a fire door stay open during normal use but release it automatically during a fire, must meet the requirements set out in this article.
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.