Code Library › Volume 1 › Section 3.6 — Service Facilities
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.6.3.4.Exhaust Duct Negative Pressure

(1) If a vertical service space contains an exhaust duct that serves more than one fire compartment, the duct shall have a fan located at or near the exhaust outlet to ensure that the duct is under negative pressure.
← Previous3.6.3.3. Linen and Refuse ChutesNext →3.6.3.5. Grease Duct Enclosures (See Note A- 3.6.3.5.)

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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.