S-2.1, r. 6 - Regulation respecting industrial and commercial establishments

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4.2.1. Any stair, elevator, ventilation or light shaft or other opening between floors, shall be so enclosed as to prevent the spreading of flames or smoke, except for openings specified in sections 4.2.2, 4.2.3 and 4.2.4.
R.R.Q., 1981, c. S-2.1, r. 9, s. 4.2.1.