The Ontario Building Code | Outdoor Design Temperatures
9.33.3.2. outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">door Design temperatures
(1) The outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">door conditions to be used in designing heating, ventilating and air-conditioning systems shall be the appropriate values for the location as set out in MMAH Supplementary Standard SB-1, "Climatic and Seismic Data", using 2.5 percent design temperature criteria.
9.33.4. Carbon Monoxide Alarms
In Plain Language
Outdoor design temperatures, reflecting expected local winter conditions, are set out in this article for use in heating system sizing calculations.
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.