Code Library › Volume 1 › Section 6.3 — Ventilation Systems

PART 6 — HEATING, VENTILATING AND AIR-CONDITIONINGUpdated for the 2024 Ontario Building Code

6.3.4.3.Enclosure Exhaust Ventilation

(1) The ventilation system for a power-ventilated enclosure referred to in Article 6.3.4.2A. shall
     (a) conform to NFPA 91, “Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate
         Solids,”
     (b) provide continuous exhaust ventilation at an air velocity sufficient to prevent the accumulation of combustible or
         reactive deposits in the power-ventilated enclosure and its exhaust duct system,
     (c) confine dangerous goods vapours and particles to the area where they are generated and exhaust them to the
         outdoors,
     (d) not return the exhausted air to the building, and
     (e) be provided with well identified control switches that are
            (i) located outside the power-ventilated enclosure, and
           (ii) readily accessible in case of an emergency.

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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.