This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
Markham's Builder Tip No. 23, dated January 1, 2025 and updated to the 2024 OBC, one of the City's non-housing tips under the 2024 Ontario Building Code. It quotes Article 3.1.8.1. on fire separations as continuous elements, Article 3.1.8.7. on where fire dampers go, and Article 3.1.8.10., Installation of Fire Dampers, on dampers in the plane of the fire separation, fusible links to ULC-S505, heat-actuated devices, tested orientation and access doors. Its objective adds gypsum board lining around the duct opening, shown in a sketch.
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