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Every room in a dry cleaning building in which a flammable solvent having a flash point below 140 degrees Fahrenheit (closed cup tester) is used shall be provided with an exit directly to the outside of the building. Every door to such a room shall open outward. Any stairway for such a building shall be a smokeproof tower or exterior stairway. There shall be no window or ventilating opening within five feet of any such stairway. An open balcony or runway leading to a stairway shall be considered as such means of exit, but there shall be no window or ventilating opening upon or below such balcony.
(Prior code § 60-29)