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630 MOTION PICTURE HANDBOOK
The air may be cooled by blowing it over cakes of ice, or through a maze of cold water pipes. This is effective, but costly, unless there is an unlimited supply of cold water available at very low cost.
It is also a fact that three or four large cakes of ice located at a convenient point in the auditorium will radiate a surprising amount of cool air for quite a distance, and, moreover, the sight of the ice has a certain amount of auto-suggestive effect on the audience.
Where a new theatre is under construction it is always advisable to consult a sanitary engineer with regard to the ventilation of the auditorium. It is a subject of too much importance to be in other than thoroughly competent hands.
Ventilating Toilet Room. — Toilet rooms should invariably be ventilated by suction. In other words, the fan should pull the air out of the toilet room. Never, under any conditions, ventilate a toilet room by forcing air in. The reasons for this I think are too obvious to require discussion.
In this connection, let it be clearly understood that when it comes to moving air, the volume of movement will depend largely upon the fan area. This seems a simple statement, but when you come to think of it, it really means that every increase in diameter is effective by four times, £hus: A 36-inch exhaust fan will remove four times the amount of air that an 18-inch fan will move, both running at the same speed. It follows that the larger fan is very much better adapted to use in theatres from more viewpoints than one. It will move a vastly greater amount of air at a very much lower speed than will its smaller diametered brother. It will be found as cheap, or cheaper, in first cost, to install one large exhaust fan than two small ones of equal combined capacity. It will be found that one large will move a cubic yard of air cheaper than will two smaller ones, and that the upkeep cost of one large fan will be less than that of two small ones of equal combined capacity — provided that the large and small fans be of equal excellence in mechanical and electrical construction.
Don't buy cheap fans. It costs more in the first outlay — considerably more — to get good fans, but it pays in the long run, both in money and in the saving of temper. A cheap fan is not only ineffective, but its up-keep is usually very expensive; also its useful life is short. Still worse than all this, however, is the fact that it is a continual source of annoyance, because there is usually something wrong with it about half the time, and it is generally out of commission when most needed.
A great many sets of rules are given for figuring the necessary