The Ontario Building Code | Scope
3.6.1.1. Scope
(1) The provisions of this Section apply to horizontal service spaces, vertical service spaces, attic or roof spaces, ducts, crawl spaces, shaft spaces, service rooms, and mechanical penthouses, and facilities contained in any of them.
(2) Except for plenum requirements in 3.6.4.3., the fire safety characteristics of heating, ventilating and air-conditioning systems shall comply with Part 6.
In Plain Language
Section 3.6 (Service Spaces) applies to horizontal and vertical service spaces, attics, roof spaces, ducts, crawl spaces, shafts, and service rooms, with mechanical system fire-safety details generally governed by Part 6 instead, apart from specific plenum rules.
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.