Code Library › Volume 1 › Section 6.3 — Ventilation Systems

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

6.3.2.8.Makeup Air (See Note A-6.2.1.1.)

(1) In ventilating systems that exhaust air to the outdoors, provision shall be made for the admission of a supply of
     makeup air in sufficient quantity so that the operation of the exhaust system and other exhaust equipment or combustion
     equipment is not adversely affected.

     (2) Makeup air facilities required by Sentence (1) shall be interlocked with the exhaust devices they serve so that both
     operate together.

     (3) Where makeup air facilities are intended to introduce air directly from the outdoors to occupied parts of the building
     in winter, they shall incorporate means of tempering that air to maintain the indoor design temperature.

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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.