Section 400.18649. Stairways and other vertical openings.

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(1) In buildings of fire-resistant construction,   an interior stairway shall be enclosed with material that has a fire-resistance rating of not less than 1 hour. In buildings   of wood joist construction an interior stairway shall be enclosed with   material    having 1/2-hour-fire-resistance rating. One quarter-inch wired glass in a   steel frame meets the 1/2-hour requirement.

(2) An elevator or dumbwaiter shaft shall be completely enclosed by noncombustible materials that have a fire-resistance rating of not less than 1 hour. An opening shall not be allowed through the side   wall enclosures for ventilating or other purposes. A door that services an elevator or dumbwaiter shall be of solid construction, be reasonably smoketight when closed, and shall be constructed   to resist fire   for   1 hour.

Exception: A door in an elevator may have wired glass that     is    not    more than 6 square feet.

History: 1994 AACS.

                    
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