2.4.2.1.Required Ventilation

(1) Except as provided in Sentence (2), the rates at which outdoor air is supplied in farm buildings by ventilation
  systems shall be in accordance with good engineering practice as described in Article 6.2.1.1. (See Note A-2.4.2.1.(1))

  (2) Except as otherwise provided in this Subsection, farm buildings containing a Group G, Division 4 major occupancy
  need not comply with Sentence (1).

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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.