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The Lennox 16M84 is a genuine OEM expansion valve engineered to regulate refrigerant flow into the evaporator coil, maintaining the correct superheat levels needed for efficient and reliable Lennox system operation. When this valve malfunctions, common symptoms include reduced cooling capacity, evaporator coil freeze-up, abnormal system pressures, or reduced overall HVAC efficiency. As a direct OEM Lennox replacement, the 16M84 guarantees precise fitment and restores your system to factory performance standards.