§ 19.09. Portable booth for temporary exhibitions. Where motion pictures are exhibited daily for not more than one month, or not more often than three times a week, in educational or religious institutions or bona fide social, scientific, political or athletic clubs, a portable booth may be substituted for the booth required in sections 19.01 and 19.03 of this article. Such booth shall have a height of not less than six feet and an area of not less than twenty square feet and shall be constructed of asbestos board, sheet steel of no less gauge than twenty-four; or some other approved fireproof material. Such portable booth shall conform to the specifications of section 19.03 of this article with reference to windows and door, but not with reference to vent flues. The floor of such booth shall be elevated above the permanent support on which it is placed by a space of at least one-half inch, sufficient to allow the passage of air between the floor of the booth and the platform on which the booth rests, and the booth shall be insulated so that it will not conduct electricity to any other portion of the building.