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Sept., 1942] PROJECTION ROOM PLANS 163 EQUIPMENT (12.1) Projection Room. —All equipment to be used in the projection room, including the projectors, arc lamps, sound equipment, etc., shall be of approved type. All shelves, furniture, and fixtures within the projection room suite shall be constructed of metal or other non-combustible and approved material. An approved metal container shall be provided for hot carbon stubs. Adequate locker space for projectionists' clothing shall be provided. (12.2) Rewind Room. —In the rewind room shall be provided an approved fireproof film-cabinet or safe, a rewind table, approved rewind equipment, a mechanical film-splicer, an approved film-scrap can, and an approved storage cabinet for film-leaders, snipes, etc. t used only at various intervals. The film-cabinet, or safe, shall be capable of holding 25,000 feet of 35-mm film on standard reels. Doors on film-cabinets or safes shall be of the automatic tight-closing type, and either of the single-reel compartment or single-compartment type. Film-cabinets of the single-compartment type holding in excess of 50 pounds of film (10,000 feet) should be vented to the outside air by means of a gravity vent. The vent should not be less than 36 square-inches in area for each 50 pounds of film stored. This vent shall be constructed of non-combustible material and shall be kept at least 2 inches from any combustible material, or shall be separated therefrom by approved non-combustible material not less than one inch thick. Film- cabinets of the single-compartment type having a capacity of more than 50 pounds of film (10,000 feet) also should be equipped with an automatic sprinkler-head, of the 3 /4-inch size, connected to the theater water-supply. It is recommended that pressure at such sprinkler head be not less than 15 pounds. All tables, racks, and all furniture shall be of metal or other ap- proved non-combustible material, and shall be kept at least four inches away from any radiator or heating apparatus. Tables shall not be provided with racks or shelves beneath them whereon may be kept film or other materials. The film-scrap can shall have an automatic, self-closing lid, and shall be of approved type. It is recommended that a type designed to keep scrap-film immersed in water at all times be used. Quantities of collodion, amyl acetate, or other inflammable cements