The Ontario Building Code | Signs within Exit Facilities
220.127.116.11. Signs within Exit Facilities
(1) In a building more than 2 storeys in building height, any part of an exit ramp or stair that continues up or down past the lowest exit level shall be clearly marked by a sign indicating that it does not lead to an exit.
(2) An exit stair serving a building more than 6 storeysin building height shall be clearly marked by signs indicating that it does not lead to an exit at the roof level.
3.4.6. Types of Exit Facilities