The Ontario Building Code | Hazardous Gases, Dusts or Liquids
6.2.2.5. Hazardous Gases, Dusts or Liquids
(1) Except as provided in Subsection 6.2.13., 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 is described in the publications of the National Fire Protection Association and in the CCBFC NRCC 53303, "National Fire Code of Canada".
(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 outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors, or
(b) designed to prevent the accumulation of flammable vapours.
In Plain Language
Except as provided in the laboratory-specific Subsection 6.2.13, systems serving spaces containing hazardous gases, dusts, or liquids must be designed with ventilation appropriate to that specific hazard.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.