Supco SHF120 Thermostat Fan Control

Supco SHF120 Thermostat Fan Control regulates blower fan operation by switching the fan circuit on and off based on sensed air temperature. It operates through an internal thermal sensing element that responds to changes and activates electrical contacts at preset limits to coordinate fan start and stop timing. The control is mounted inside the furnace or air handler cabinet typically in the airstream near the heat source for accurate sensing and operation. In HVAC systems such as forced-air furnaces and air handling units, it helps align airflow with heating cycles, reducing cold air discharge and supporting controlled temperature.