CURRENT SENSING APPARATUS

This application relates to a fan control apparatus for actuating a fan to circulate air over a plurality of electric environmental change elements included in a temperature control system. The apparatus includes a fan in circuit with switch means which is operative in response to an electrical signal to actuate the fan. A sensing element is disposed in electrically inductive relationship with the environmental change elements and is responsive to energization of any one of such elements to generate said electrical signal and effect closing of the switch means to actuate the fan. The signal will continue and maintain the fan operative as long as the environmental change elements are energized and will be rendered inoperative when the last change element is de-energized thus discontinuing said signal and deactuating said fan.