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THE PROJECTION ROOM 259
be by forced draft. The heat generated within the lamphouse is unbearable. Natural air movement may serve in time of cold weather but in the hot summertime it fails utterly to provide the necessary relief. This is particularly true of the South, where warm weather prevails almost throughout the entire year.
But consider the importance of forced draft if a fire in the projection room occurs. By turning on the full power of the ventilating fans as soon as a fire breaks out, the air will be sucked forcibly and rapidly away from the auditorium side and — if the port shutters are closed at once — not even a wisp of smoke or gas will be allowed to pass through the crevices. The audience will not be aware of a fire, though they will guess at some difficulty in projection because of the dark screen. That is better than a panic.
(64) Authorities recommend that projection room ventilation, for reasons of health, should be effected through the theatre's forced draft system where there is one, and that a separate fan and outlet be provided for emergency use only in the event of a fire. If there is no forced draft system, then a fan of proper capacity should be installed in the lower end of the outlet air duct and all inlet air ducts shuttered so that the flow of air may be controlled to meet varying conditions.
For Use in Case of Film Fire
(65) In addition to this it is advisable to install an exhaust fan removed from places where fire is likely to originate. It may be installed in a fireproof cabinet in the main projection room, connecting with an outside air duct. Normally this fan is controlled by a switch held in closed position by a spring, but during the hours of operation it must be open against the action of the spring by means of a strong cord, wire or chain attached to the port fire shutter master control. When, in an emergency, the shutter control is released, it will close the switch, thus instantly putting the exhaust fan into action to the limit of its power. The plan is roughly