. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 168. Diaphragm Motor for Operating Fig. 169. Mixing Dampers. which is connected to the damper by means of chains or levers,thus securing the desired movement. A diaphragm of this kindis shown in Fig. 168. Dampers.—A common form of mixing damper for use in con-nection with indirect heating stacks is shown in Fig. 169, and shows the same in position and connected with a diaphragmmotor for pneumatic actuation. Fig. 171 illustrates a good ar-rangement of mixing
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 168. Diaphragm Motor for Operating Fig. 169. Mixing Dampers. which is connected to the damper by means of chains or levers,thus securing the desired movement. A diaphragm of this kindis shown in Fig. 168. Dampers.—A common form of mixing damper for use in con-nection with indirect heating stacks is shown in Fig. 169, and shows the same in position and connected with a diaphragmmotor for pneumatic actuation. Fig. 171 illustrates a good ar-rangement of mixing dampers for the double-duct system wherethe hot and tempered air are mixed at the bases of the uptakeflues. SPECIAL DEVICES 243 When mixing dampers are operated pnuematically a speciallydesigned thermostat for giving a graduated movement to thedamper should be used. By this arrangement the damper is heldin such a position at all times as to admit the proper proportionsof hot and cold or tempered air for producing the desired tem-perature in the room with which it is connected. With the ordinary form of thermostat the damper will be eitherentirely closed or
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