National Building Code of Canada - Section 288

Division B 3.4.5.1. iii) the fire separation between the lobby and adjacent occupancies that are permitted to open onto the lobby need not have a fire-resistance rating provided the lobby and adjacent occupancies are sprinklered ,and iv) passenger elevators are permitted to open onto the lobby, provided the elevator doors are designed to remain closed except while loading and unloading passengers, and f) a fire separation , constructed in accordance with Sentence 3.4.4.1.(1), is maintained between the lobby and any exit permitted by this Sentence to lead through the lobby. 3.4.4.3. Exterior Passageway Exceptions 1) The requirements of Sentences 3.4.4.1.(1) and 3.2.3.13.(1) and (3) do not apply to an exterior exit passageway provided a) not less than 50% of the exterior side is open to the outdoors, and b) an exit stair is provided at each end of the passageway. 3.4.4.4. Integrity of Exits 1) A fire separation that separates an ex it from the remainder of the building shall have no openings except for a) standpipe and sprinkler piping, b) electrical wires and cables, totall y enclosed noncombustible raceways and noncombustible piping that serve only the exit , c) openings required by the provisions of Subsection 3.2.6., d) exit doorways, and e) wired glass and glass block permitted by Article 3.1.8.16. 2) Exits within scissors stairs and other contiguous exit stairways shall be separated from each other by a smoke-tight fire separation having a fire-resistance rating not less than that required for the floor assembly through which they pass. 3) Fire separations separating contiguous stairs described in Sentence (2) shall not be pierced by doorways, ductwork, piping or any other openings that affect the continuity of the separation. 4) Afuel-fired appliance shall not be installed in an exit . 5) An exit shall not be used as a plenum for a heating, ventilating or air-conditioning system. 6) An exit shall be designed for no purpose other than for exiting, except that an exit is permitted also to be designed to serve as an access to a floor area . 7) A service room shall not open directly into an exit . 8) Storage rooms, washrooms, toilet rooms, laundry rooms and similar ancillary rooms shall not open directly into an exit . 9) Service spaces r eferred to in Sentence 3.2.1.1.(8) shall not open directly into an exit . 3.4.5. Exit Signs 3.4.5.1. Exit Signs 1) Every exit door shall have an exit sign providing visual information placed over or adjacent to it if the exit serves a) a building more than 2 storeys in building height , b) a building having an occupant load of more than 150, or c) a room or floor area that has a fire escape as part of a required means of egress. 2) Every exit sign providing visual information shall a) be visible on approach to the exit , b) consist of a green and white or lightly tinted graphical symbol meeting the colour specifications referred t o in ISO 3864-1, “Graphical symbols – National Building Code of Canada 2025 Volume 1 Division B 3-149