2.4.2.5.Below-Floor Storage of Liquid Manure (See Note A-2.4.2.5.) (See also Note A-2.2.8.3.)

(1) Farm buildings housing livestock with below-floor storage of liquid manure shall be provided with a ventilation
     system that supplies outdoor air at a rate that is
     (a) sufficient to limit the concentrations of dangerous goods classified as flammable gases to not more than 25% of their
          lower explosive limit,
     (b) sufficient to limit the concentrations of dangerous goods classified as toxic gases to those permitted in the
          ACGIH's “Industrial Ventilation: A Manual of Recommended Practice for Design,” and
     (c) not less than 2 air changes per hour.
     (See Note A-2.4.2.5.(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.