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(a) Stairways shall be constructed entirely of non- combustible materials and shall be enclosed by walls providing fire resistance of not less than three hours. If two smokeproof towers are provided the stairways shall be constructed entirely of noncombustible materials and shall be enclosed by walls providing fire resistance of not less than two hours.
(b) There shall be no openings in walls separating the enclosure from the interior of the building. Openings in an exterior wall of the enclosure shall be permitted only when such openings are located not less than 30 feet from any opening in the walls of the same building or an adjacent building. Such openings in an exterior wall shall be protected by fixed or automatic fire windows or shutters.
(c) The bottom of an enclosure and the top of an enclosure shall be of construction providing fire resistance of not less than three hours. If two smokeproof towers are provided the bottom of an enclosure and the top of an enclosure shall be of construction providing fire resistance of not less than two hours.
(Prior code § 67-11.1)