Code Library › Volume 1 › Section 9.22 — Fireplaces
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.22.9.4.Heat Circulating Duct Outlets

(1) The clearance of combustible material above heat-circulating duct outlets from those outlets shall be not less than (a) 300 mm where the combustible material projects not less than 38 mm from the face, and (b) 150 mm where the projection is less than 38 mm.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.