Description
The Supco SHF140 Fan Control F140-20F temperature-based fan limit is used to regulate blower fan operation in HVAC systems. It is mounted in the air handler or furnace plenum, where it senses air level and switches the fan circuit on and off based on preset cut-in and cut-out values. This support coordinates blower operation with heating cycle stages to prevent unconditioned air circulation and support safe heat exchanger operation. It is commonly used in furnace systems and air handling units, where it manages fan activation timing to airflow with internal temperature conditions within the HVAC systems.
