Dayton controls when used with a Dayton EC motor can maximize the efficiency of the ventilation system. Controls can be used in manual or automated operation to control the demand of the ventilation system. Recommended for use in schools, restaurants, multi-family structures, and condos. Meet your application requirements with this control by selecting between two speed settings using one switch. Connect a single pole double-throw switch or relay (connected to thermostat, timer etc.) and toggle between the two speeds for infinitely adjustable high and low speed settings.