The Lennox 49M84 Flame Sensor is a reliable safety component designed to detect and monitor the burner flame in Lennox gas furnace systems. It works by sensing the presence of a flame and sending a signal to the control board to confirm proper ignition, ensuring safe and efficient operation. Commonly used in residential and commercial furnaces, this sensor helps prevent unburned gas b... https://www.partshnc.com/flame-sensor-37