§ 19.03. Construction of booth; approval of plans and specifications. The booths provided for in section 19.01 of this article shall be constructed according to plans and specifications which shall have been first approved, in a city, by the mayor or chief executive officer of the city department having supervision of the erection of buildings in such city; in a village, by the mayor of such village; in a town outside the boundaries of a city or village, by the supervisor of such town. Provided, however, that no plans and specifications for the construction of such booths shall be approved by any public official, unless the following requirements are substantially provided for in such plans and specifications:

1. Dimensions. Such booths shall be at least six feet in height. If one machine is to be operated in such booth the floor space shall be not less than forty-eight square feet. If more than one machine is to be operated therein, an additional twenty-four square feet shall be provided for each such additional machine.

2. General specifications. In case such booth is not constructed of concrete, brick, hollow tile or other approved fireproof material than asbestos, such booth shall be constructed with an angle framework of approved fireproof material, the angles to be not less than one and one-quarter inches by three-sixteenths of an inch thick, the adjacent members being joined firmly with angle plates of metal. The angle members of the framework shall be spaced not more than four feet apart on the sides and not more than three feet apart on the front and back and top of such booth. The sheets of asbestos board or other approved fire-resisting material shall be at least one-quarter of an inch in thickness and shall be securely attached to the framework by means of metal bolts and rivets. The fire-resisting material shall completely cover the sides, top and all joints of such booth. The floor space occupied by the booth shall be covered with fire-resisting material not less than three-eighths of an inch in thickness. The booth shall be insulated so that it will not conduct electricity to any other portion of the building. There shall be provided for the booth a door not less than two feet wide and five feet ten inches high, consisting of an angle frame of approved fireproof material covered with sheets of approved fireproof material one-quarter of an inch thick, and attached to the framework of the booth by hinges, in such a manner that the door shall be kept closed at all times, when not used for ingress or egress.

The operating windows, one for each machine to be operated therein and one for the operator thereof, shall be no larger than reasonably necessary, to secure the desired service, and shutters of approved fireproof material shall be provided for each window. When the windows are open, the shutters shall be so suspended and arranged that they will automatically close the window openings, upon the operating of some suitable fusible or mechanical releasing device.

Where a booth is so built that it may be constructed to open directly on the outside of the building through a window, such window shall be permitted for the comfort of the operator, but such booth shall not be exempted from the requirement of the installation of a vent flue as hereinafter prescribed. Said booth shall contain an approved fireproof box for the storage of films not on the projecting machine. Films shall not be stored in any other place on the premises; they shall be rewound and repaired either in the booth or in some other fireproof inclosure. The booth in which the picture machine is operated shall be provided with an opening or vent flue in its roof or upper part of its side wall leading to the outdoor air. The vent flue shall have a minimum cross-sectional area of fifty square inches and shall be fireproof. When the booth is in use there shall be a constant current of air passing outward through said opening or vent flue at the rate of not less than thirty cubic feet per minute.