The Ontario Building Code | Enclosure Construction
6.2.13.5. Enclosure Construction
(1) The power-ventilated enclosure referred to in Article 6.2.13.3. and its exhaust duct system shall,
(a) except as provided in Sentences (2) and (3), be constructed of noncombustiblematerials compatible with and chemically resistant to the flammable 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 system if,
(a) such materials are required by the corrosive or reactive properties of the chemicals or liquids being used, and
(b) their flame-spread rating is not more than 25.
(3) The flame-spread rating required in 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 ductsystem.
Section 6.3. Chimneys and venting ="http://thehandyforce.com/interior/bathroom-renovations/" title ="Toronto Bathroom renovation inspiration">venting Equipment
6.3.1. General
In Plain Language
A power-ventilated enclosure and its exhaust duct system must generally be constructed of specific materials meeting this article's requirements, addressing the corrosive and flammable nature of laboratory exhaust.
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.