The Ontario Building Code | Outside Design Conditions
6.2.1.7. Outside design Conditions
(1) The outside conditions to be used in designing heating, ventilating and air-conditioning systems shall be determined in conformance with MMAH Supplementary Standard SB-1, "Climatic and Seismic Data".
In Plain Language
Outside design conditions used for sizing heating, ventilating, and air-conditioning systems must be determined per the referenced supplementary standard covering climatic data for different locations.
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.