§ 57. Vertical and horizontal openings. In order to prevent the\nvertical and horizontal spread of fire, smoke and gases, it shall, in\naddition to other applicable provisions of this article, be necessary to\ncomply with the requirements of this section.\n 1. All doors opening from shafts, stair halls or stairs and the door\nassemblies shall be fire-retarded with the doors self-closing and\nwithout transoms or any other opening. Except in the case of elevator\nshafts, such shafts, stair halls or stairs may be protected by an\nautomatic sprinkler system in lieu of fire retarding.\n 2. All other doors opening upon entrance halls or other public halls\nor corridors in every part of the dwelling shall be self-closing, except\nwhere such dwelling is equipped throughout with an approved type\nautomatic sprinkler or fire-detecting system. It shall be unlawful to\nattach to or maintain on or about any door required to be self-closing\nany device which prevents the self-closing of such door.\n 3. Every existing interior glazed sash, window or opening, other than\na door, or a fireproof sash, window or opening glazed with wire glass,\nin any partition forming required enclosures around stairs or shafts\nshall be removed and the openings closed up and fire-retarded.\n
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