Cyclopedia of heating, plumbing and sanitation; a complete reference work . er near the ceiling vents, in both halls andchurches, should be provided withdampers having means for hold-ing them in any desired indirect gravity heaters areused, it will generally he necessaryto place heating coils in the ventfines for use in mild weather; butif the fresh air is supplied bymeans of a fan, there will usually bepressure enough in the room to force the air out without the aid ofother means. When the vent air-ways are restricted, or the air i^impeded in any way, electric ventilatin
Cyclopedia of heating, plumbing and sanitation; a complete reference work . er near the ceiling vents, in both halls andchurches, should be provided withdampers having means for hold-ing them in any desired indirect gravity heaters areused, it will generally he necessaryto place heating coils in the ventfines for use in mild weather; butif the fresh air is supplied bymeans of a fan, there will usually bepressure enough in the room to force the air out without the aid ofother means. When the vent air-ways are restricted, or the air i^impeded in any way, electric ventilating fans are often used. Thesegive especially good results in warmer weather, when natural venti-lation is sluggish. The temperature may be regulated either byusing the double-duet system or by shutting oft or turning on a greateror less number of sections in the main heater. After an audiencehall is once warmed and filled with people, very little heat is requiredto keep it comfortable, even in the coldest weather. Theaters. Iv designing heating and ventilating systems for. Fig. 174. An Approved Mel hod of De-livering Warm Air to the Audi-torium of a Church. 216 HEATING AND VENTILATION 207 theaters, a wide experience and the greatesl care are necessary tosecure the best results. A theater consists of three parts: the bodyof the house, or auditorium; the stage and dressing-rooms, and thefoyer, lobbies, corridors, stairways, and offices. Theaters are usuallylocated in cities, and surrounded with other buildings on two or moresides, thus allowing no direct connection by windows with the ex-ternal air; for this reason artificial means are necessary for providingsuitable ventilation, and a forced circulation by means of a fan is theonly satisfactory means of accomplishing this. It is usually advisableto create a slight excess of pressure in the auditorium, in order thatall openings shall allow for the discharge rather than the inwardleakage of air. The general and most approved method
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