PART 6 — HEATING, VENTILATING AND AIR-CONDITIONINGUpdated for the 2024 Ontario Building Code
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6.9.1.2.Hazardous Gases, Dusts or Liquids
(1) Except as provided in Subsection 6.3.4., systems serving spaces that contain hazardous gases, dusts or liquids shall
be designed, constructed and installed in conformance with the provisions of the Fire Code made under the Fire
Protection and Prevention Act, 1997, or in the absence of requirements pertinent to such systems in the Fire Code, to
good engineering practice such as that described in the publications of the National Fire Protection Association and in the
CCBFC NRCC-CONST-56437E, "National Fire Code of Canada. (See Note A-6.9.1.2.(1))
(2) When indoor piping for Class I flammable liquids is installed in a trench, the trench shall be
(a) provided with positive ventilation to the outdoors, or
(b) designed to prevent the accumulation of flammable vapours.
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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.