Code Library › Volume 1 › Section 6.3 — Ventilation Systems

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

6.3.2.13.Filters

(1) Air filters for air duct systems shall conform to the requirements for Class 2 air filter units as described in
          CAN/ULC-S111, “Standard Method of Fire Tests for Air Filter Units.”

          (2) When electrostatic-type filters are used, they shall be installed so as to ensure that the electric circuit is automatically
          de-energized when filter access doors are opened or, in dwelling units, when the furnace circulation fan is not operating.

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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.