The Trane SEN1519 is a 3-speed fan sensor specifically designed for Trane HVAC equipment. This small, cube-shaped sensor (measuring 1 inch on all sides and weighing 0.22 pounds) plays a vital role in regulating airflow within your system. By monitoring the air temperature inside the unit, the sensor transmits a signal to the control board. The control board then adjusts the fan speed ... https://www.partshnc.com/3speed-fan-sensor-5