PART 6 — HEATING, VENTILATING AND AIR-CONDITIONINGUpdated for the 2024 Ontario Building Code
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6.3.4.4.Enclosure Construction
(1) The power-ventilated enclosure referred to in Article 6.3.4.2A. and its exhaust duct system shall
(a) except as provided in Sentences (2) and (3), be constructed of noncombustible materials compatible with and
chemically resistant to the dangerous goods vapours and particles being exhausted, and
(b) be provided with access doors to permit inspection and maintenance of the fan assembly and exhaust ducts.
(2) Combustible materials are permitted in the power-ventilated enclosure described in Sentence (1) and its exhaust duct
systems if
(a) such materials are required by the corrosive or reactive properties of the dangerous goods being used, and
(b) their flame-spread rating is not more than 25.
(3) The flame-spread rating required by Sentence (2) is permitted to be greater than 25 if an automatic fire suppression
system is provided inside the power-ventilated enclosure and its exhaust duct system.
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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.