The Ontario Building Code | Application
9.21.1.1. application
(1) This Section applies to,
(a) rectangular masonry or concrete chimneys not more than 12 m in height serving fireplaces or serving appliances having a combined total rated heat output of 120 kW or less, and
(b) flue pipesserving solid fuel-burning appliances.
(2) Except as provided in Sentence 9.21.1.3.(1), chimneys (other than those described in Sentence (1) and Sentence 9.21.1.2.(1)), gas vents and flue pipesserving gas-, oil- or solid fuel-burning appliancesand associated equipment shall conform to Section 6.3.
In Plain Language
This article sets out when the chimney and flue pipe requirements in this Section apply, covering the systems that vent combustion byproducts from heating appliances and fireplaces.
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.