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

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4.2.4. Any vertical opening in a new or existing high hazard establishment shall be enclosed, except in the case where some unprotected openings are necessary for process and operation and where distinct isolated or enclosed exits are provided, and providing that the Inspection Service has given its approval.
R.R.Q., 1981, c. S-2.1, r. 9, s. 4.2.4.