(1) The cinematograph machines shall be placed in a permanent enclosure of sufficient dimensions to allow the operator to work freely. The enclosure shall be substantially constructed of fire-resisting materials or lined with the same.
(2) The entrance to the enclosure shall be fitted with a closely fitting door of fire-resisting material suitably placed and opening outwards and all openings, bushes and joints shall be so constructed and maintained as to prevent so far as possible the escape of any smoke into the auditorium. If means of ventilation are provided they shall not be allowed to communicate direct with the auditorium. The area of the ventilating ducts of the enclosure shall not be less than one percent, of its floor area.
Explanation.- By 'bush' is meant packing inserted in the holes through which the pipes and cables pass in order to render such holes reasonably smoke-proof.
(3) Openings not exceeding six in number shall be permitted in the front, face of the enclosure, the central one of which must not exceed 8 inches square and those on each side 6 inches square. The projector opening must be fitted with a screen of fire-resisting material capable of being actuated both from the inside and from the outside of the enclosure.
(4) The necessary pipes and cables shall enter through efficiently bushed openings.
(5) No. unnecessary combustible material shall be allowed within the enclosure, and as far as possible all necessary combustible material, films and the like, when not in use shall be kept in fireproof receptacles suitable for the purpose.