The Ontario Building Code | Restricted Use of Horizontal Exits
188.8.131.52. Restricted Use of Horizontal Exits
(1) Except as permitted by Sentence (2), horizontal exits shall not comprise more than one-half of the required number of exits from any floor area.
(2) In a hospital or long-term care home, horizontal exits serving patients’ or residents’ sleeping rooms shall comprise not more than two-thirds of the required number of exitsfrom any floor area.
(3) Where an elementary or secondary school is subdivided by a firewall, a horizontal exitshall not serve as an exit but is permitted to serve as an access to exit.