Description
The Lennox 19L22 6″ Return Air Sensor is a duct-mounted temperature sensing probe used to monitor return air conditions and provide resistance-based feedback to control systems. It features a 20K ohm thermistor element that converts air temperature into an electrical signal for system regulation. Installed in ductwork and air handling units, it operates track airflow conditions entering the equipment for accurate system adjustment and protection. This component is used in HVAC as a sensing element that supports temperature monitoring, system control accuracy, and stable operation of air conditioning and heating equipment.
