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THE PROJECTION ROOM 261
(68) In Fig. 71 it will be observed that the arrangement provides for an air injector, or ejector if you like that term better. It is very powerful in creating air movement.
(69) The air outlet should be of fireproof material, well insulated from all combustible matter nearby. There must be no sharp bends or elbows in the exhaust duct. The fan can be installed in the lower end of the duct itself provided the duct has sufficient diameter, and the fan can be geared to a well-protected motor. (70) Do not install the motor in the duct because it will be in the path of hot air and possibly flame and would be put out of commission immediately in case of an open film fire. The accompanying drawing is designed only to convey the general idea. Details of installation will vary widely for each theatre.
(71) What is wanted is plenty of fan power that will cut into maximum power the moment a fire starts, the driving motor well protected from heat.
Painting the Projection Room
(72) When the cove trough method of lighting is employed use non-gloss paint because it has least light reflection powers. A gloss white paint is best for the portion of the ceiling at the rear of the cove trough, and on the upper portion of the rear wall. The lower portion of the rear wall, the entire side walls and the front wall should be in either dark olive or dark brown color, well stippled to reduce reflection. The ceiling in front of the cove trough may be any color, but a light buff is suggested. It is, perhaps, not a pretty room, but it serves projection requirements most efficiently.
(73) Where the room is lighted in the usual manner, the rear and side walls, including all doors, should be painted a dark color, preferably an olive green or dark brow^n, seven feet high in an 8-foot ceiling room or eight feet in a higher room. The front wall should be darker than the walls — the darker the better. Dark olive green or its equivalent in brown will serve well. (74) All front wall metal work and an eighteen-inch area surrounding