It shall be the duty of the owner or occupant in charge of any building or hall used as an assembly hall with accommodations for one hundred (100) persons or more in which theatricals, shows, amusements, lectures and other entertainment is offered, operated or presented to provide and place a lighted red sign, on which the word "EXIT" shall appear in letters at least six inches (6") high, over every door or other opening from such hall to every means of egress therefrom; said lighted red sign shall be kept burning during the entire period that the hall is open to the public and until the audience has left the hall. (1979 Code Ch. 12, Art. I, §12)