Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 237
ch iscontrolled by a chainfrom the room above,and so designed as toadmit either a full vol-ume of hot air, a fullvolume of cool ortempered air, or to mix them in any desired proportion without affect-ing the resulting total volume delivered to the room. A damper othis form is shown in Fig. IGl.… … Fig. 161. Mixing Damper for Regulating Temperatureof Air .Supplied by Double-Duct System. 194 HEATING AND VENTILATION 185 der is by-passed under the heater into the cold-air pipes. Mixing
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