Code Library › Volume 1 › Section 3.2 — Building Fire Safety
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.2.4.12.Prevention of Smoke Circulation

(1) If a fire alarm system is installed, an air-handling system shall be designed to prevent the circulation of smoke upon a signal from a duct-type smoke detector if the air handling system (a) serves more than one storey, (b) serves more than one suite in a storey, (c) serves more than one fire compartment required by Sentence 3.3.3.5.(2) or Sentence 3.3.4.11.(2), or (d) is not provided with fire dampers as permitted by Sentence 3.1.8.8.(4).
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Common questions about this part of the code

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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.