In Plain Language

This clause caps the percentage of a wall's area that can be unprotected openings (like windows without fire-protection ratings) based on the exposing building face's area and limiting distance, per Table 3.2.3.1, balancing daylighting and views against fire-spread risk to neighbouring properties.

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.