15. Exits leading through occupied spaces: Half the exits serving any floor below or above the ground floor may lead through the lobby including the foyer or hall or another floor area provided that:
(a) the entrance floor is not more than 4.5 m above ground; when
(b) the travel distance to an outside exit on the ground floor does not exceed 15 m; and when
(c) rooms adjacent to the foyer or hall are isolated from the foyer or hall by a fire separation with a fire-resistance rating of at least 3/4 of an hour or protected by an approved system of automatic sprinklers or extinguishers.
The other half of exits shall lead directly outside.
R.R.Q., 1981, c. S-3, r. 4, s. 15; O.C. 88-91, s. 14.