. The principles of ventilation and heating and their practical application. ers of people are to be gathered for acomparatively short time ; in tunnels and mines, in hospitals, and for theremoval of dusts and vapors in connection with certain processes ofmanufacture. As applied to theatres and halls of assembly, the fan is usually em-ployed for the forcing of air into the room on what is called the plenumsystem, and instances of its application in this way will be found in thedescriptions of the hall of the House of Representatives in Washington,and of the Vienna, Frankfort and New York Opera
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. The principles of ventilation and heating and their practical application. ers of people are to be gathered for acomparatively short time ; in tunnels and mines, in hospitals, and for theremoval of dusts and vapors in connection with certain processes ofmanufacture. As applied to theatres and halls of assembly, the fan is usually em-ployed for the forcing of air into the room on what is called the plenumsystem, and instances of its application in this way will be found in thedescriptions of the hall of the House of Representatives in Washington, and of the Vienna, Frankfort and New York Opera Houses given inpreceding chapters. As applied to hospital ventilation, the great utility of the fan lies inthe power which it gives to rapidly flush out the wards morning andevening with large quantities of air. The effects thus produced areshown in the description of the Barnes Hospital. In some of the largerInsane Asylums of this country the propelling fan is used as a constantsource of power, as for example in the New York Asylum at Utica, VENTILATION AND HEATING. 203. Figure 64—SECTION THROUGH COIL BOX IN CELLAR. 2C4 VENTILATION AND HEATING. where two fans are employed for this purpose. Each of these fans istwelve feet in diameter, having a cross-sectional area at the point ofdelivery of a little over forty square feet. They are run day and night, and can furnish air at the rate of loo cubic feet per minute for eachoccupant. The application of the fan or blower as an aspirator is chiefly usefulto remove dusts and gases produced in a workroom, by drawing them offthrough hoods or funnels placed close to the machines or vessels inwhich these are produced, so that they are not allowed to escape andcontaminate the general air supply of the room. In this way manytrades which would otherwise be disagreeable or dangerous to health, may be so conducted as to be harmless, and the applications of thismethod are constantly increasing. When the engineer is called on to devise a plan of