(1) In this section –

“projection-room enclosure” means an enclosure in which a projection unit is operated or in which a projection unit is operated or in which the rewinding of film is undertaken or in which both such activities are conducted;

“projection unit” means a projector with or without a slides-machine.

(2) No flammable film shall be used in a projection unit in a place of assembly unless written permission is obtained from the local authority.

(3) In any building or part of a building used for cinematographically or theatrical performances the operation of a projection unit and the rewinding of film shall only be undertaken from within a projection-room enclosure, except where the provisions of subsection (15) or (20) apply.

(4) The projection-room enclosure shall comply with the following requirements—

a) it shall be not less than 4,5 metres in length and 3,5 metres in width and 2,4 metres in height for one projector with an additional unit;

b) not more than a total mass of 150 kilograms of film in their respective cases may be kept in the projection-room enclosure at any one time, and such film must be kept in their containers when not in use;

c) the projection-room enclosure shall have two means of egress through doorways, one of which shall lead direct to the open air.

(5) Every opening in the wall separating the auditorium from the projection-room enclosure shall be completely covered with armoured plate glass of at least 6 millimetres in thickness glazed into an incombustible frame.

(6) The size of such openings shall be not more than –

a) for each projector, effects-machine or slides-machine, an opening 400 × 400 millimetres;

b) one observation-opening, 400 millimetres by 300 millimetres, corresponding to each projector opening, as in paragraph (a);

c) one opening, of not more than 800 × 750 millimetres, for combined uses of operator and spotlight or the like, when the stage is used for live performances.

(7) The doors of the projection-room enclosure shall be self-closing fire-doors, each of not less than 750 millimetres in width and 2 metres in height, opening outwards, having a fire-resistance rating of not less than half an hour, and shall not communicate directly with the auditorium.

(8) The wall, floors and ceilings of the enclosure referred to in subsections (3) and (4) shall be of non-combustible materials, and shall have a fire-resistance rating of not less than one hour.

(9) All shelves, furniture and fixtures within the enclosure shall be constructed of non-combustible material or of hardwood.

(10) Carbon and Xenon, or similar type arc-lamp housings shall be ventilated by means of a ventilating-cowl fixed over each machine, and leading to the outside air or by any other approved means.

(11) The projection-room enclosure shall, in addition, be supplied with at least 6 cubic metres of air per minute from a mechanical ventilation system.

(12) All inlet and outlet ventilation-openings shall be protected by wire netting or screens of not more than 13-millimetre mesh.

(13) Provision shall be made for switching on the auditorium lights from inside the projection-room enclosure and from at least one other convenient point in the building.

(14) In the projection-room enclosure the electric lighting shall be supplied from a power-circuit separate from all other circuits, and shall also be connected, through a separate circuit, to the emergency supply referred to in paragraph (b) of subsection (24) of section 34.

(15) Where a projection unit is operated or the rewinding of film is undertaken for performances, including the illustrating of lectures, in cases where the aggregate number of days on which performances are to be given does not exceed 30 in any one year or the audience does not exceed 35 people at any one time, such usage shall comply with the following requirements—

a) the apparatus used must be of the portable type requiring a single-phase supply of not more than 13 amp at a voltage of 220-250;

b) not more than two projectors or one projector and one slides-machine may be used at any one time;

c) the apparatus must be operated from an approved non-combustible pedestal or stand;

d) the amount of film shall not exceed 50 kilograms mass in the auditorium at any time and such film shall be in containers when in not in use:

Provided that the provisions of this subsection need not be complied with if a projection-room enclosure is installed.

(16) All film not in actual us shall be kept in containers constructed of galvanized steel or other approved material and shall be constructed in an approved manner.

(17) Each container as described in subsection (16) shall contain reels of film not in excess of 50 kilograms total mass and shall have a tight self-closing door or lid of similar material.

(18) “NO SMOKING” signs, in clearly legible block letters, of at least 100 millimetres in height, shall be placed in prominent positions in the projection-room enclosure.

(19) Every Projection-room enclosure shall be provided with at least one approved hand fire-extinguisher, a face shield and pair of leather gloves, and an approved asbestos blanket measuring not least than 2 × 2 metres.

(20) The provision of this section shall not apply to the use of a projection unit in a dwelling.