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624 MOTION PICTURE HANDBOOK
Theatre Heating and Ventilating
HEATING and ventilating a theatre involves a considerable number of distinct and from some points of view entirely different problems. To go into the matter of heating and ventilating theatres with anything like completeness would not only consume a vast amount of space, but would necessarily involve many pages of highly technical text, and there seems to be no way of avoiding the use of technicalities in dealing with a matter of this kind. Not only is this true, but unless one literally made a complete book on the subject I do not believe the layman could be taught to apply the rules for figuring air pressure and resistance in inches and all that sort of thing with any degree of accuracy or success.
I shall therefore confine my remarks on these two topics largely to such things as readily can be grasped and understood by the average man. To go further than that is, I think, not advisable.
With regard to ventilation, there are, in general, two distinct problems: First, how much ought there to be; second, which is the better method of heating for the various parts of the building, direct or indirect? The first thing to do is ascertain whether or not there is a local law on the subject of theatre ventilation, and if there is what are its requirements. The provisions of local law must, of course, be complied with, but if these provisions are insufficient to provide for the comfort of the audience, then it will be better to go beyond the local requirements and provide such ventilation as will secure the comfort of the audience.
In this connection, however, it should be understood that an atmospheric condition which may be entirely healthful is not necessarily such as will produce comfort. Healthful condition merely means the supplying of sufficient fresh air to keep the vitiated atmosphere inside the theatre above a certain degree of impurity. It should also be understood that air will become impure with a greater degree of rapidity in summer time than in winter. This is by reason of the fact that whereas in the winter the air is only laden with the