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Ventilation 407
lighting the air conditions of a particular theatre will draw patronage from a competitor who neglects this important factor.
Damages.
Patron comfort is the main objective in regulating ventilation; but, irrespective of patrons, the matter is important. Defective ventilation shortens the life of theatre decorations and theatre furniture. The damage caused to drapes by dirty air is evident. Besides, if proper humidity is not maintained, overheated air causes furniture to crack, because the dry air draws out its moisture. Paintings also can be ruined if dried out by air with a low percentage of moisture which strips the paint from the canvas. Cracked ceilings, soiled drapes, warped chairs, damaged organ consoles are but a few of the many expensive effects due to improper ventilation.
Patron Comfort.
But patron comfort is the chief consideration. Certain air conditions make satisfactory entertainment impossible. Headaches, irritableness, nausea, dizziness, "that tired feeling" can be caused by two hours spent in a badly ventilated theatre. People within an enclosure absorb oxygen and breathe out carbon dioxide. Unless new oxygen is supplied, that invigorated feeling and that relaxation which entertainment should give are impossible. Besides the evident discomfort, there is serious likelihood of illness; a low percentage of moisture in the air makes one susceptible to diseases of the nose and throat because the natural moisture of the tender membranes is dried out. Drafts, too, can cause colds.
Four Factors.
Proper ventilation involves four factors: clean air, circulation, the proper temperature, and proper humidity.
The factor of cleanliness involves the elimination of odors, dust and dirt. Circulation involves the avoidance of draft, the expulsion of dead air, and a uniform supply of pure air at the rate of about 25 cubic feet of air per minute per person within the enclosure.
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