Toronto : Règlement no 629, art. (d) — Chapter 629 Property Standards

Openings through any guard that is not required by Subsection D(1)(a) and that serves a building of other than industrial occupancy shall be of a size that:

• [1] Will prevent the passage of a sphere having a diameter more than 100 millimetres;
• or [2] Will permit the passage of a sphere having a diameter more than 200 millimetres unless it can be shown that the location and size of openings that exceed these limits do not represent a hazard.