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

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4.2.3. In any existing building only, in areas protected by automatic extinguishers, the vertical openings can be unprotected if none are used as a part of a means of egress and if the required exits are smoke-proof towers, exterior stairs or horizontal protected exits.
R.R.Q., 1981, c. S-2.1, r. 9, s. 4.2.3.