Code Library › Volume 1 › Section 6.3 — Ventilation Systems

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

6.3.1.1.Required Ventilation

(1) Except as provided in Sentence (4), all buildings shall be ventilated in accordance with this Section.

e1       (2) Except in storage garages and repair garages covered by Article 6.3.1.3., outdoor air shall be supplied to buildings for
         ventilation purposes in accordance with one of the following Sections of ANSI/ASHRAE 62.1, “Ventilation for
         Acceptable Indoor Air Quality,”
         (a) Section 6.2, Ventilation Rate Procedure, excluding the exception stated in Section 6.2.7.1.2 and note H of Table
               6.2.2.1,
         (b) Section 6.3, Indoor Air Quality Procedure, or
         (c) Section 6.4, Natural Ventilation Procedure, excluding residential occupancies.

         (3) Except in storage garages and repair garages covered by Article 6.3.1.3., exhaust ventilation shall be provided in
         accordance with Section 6.5, Exhaust Ventilation, of ANSI/ASHRAE 62.1, “Ventilation for Acceptable Indoor Air
         Quality,” as a minimum.

         (4) Self-contained heating-season mechanical ventilation systems serving only one dwelling unit shall comply with
         Subsection 9.32.3.

         (5) Live/work units shall be mechanically ventilated in accordance with the requirements of Sentence (1).

Next →6.3.1.1A. Natural Ventilation

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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.