Direct OEM Fit: Engineered for seamless installation on Broan 9417DN series units

or a frosted-over evaporator coil that isn't caused by airflow restrictions

Enhanced System Reliability: Prevents heat exchanger stress by maintaining proper BTU input ratings after fuel source modification

allowing seamless compatibility with 4L

Static Balance: Factory-balanced to reduce vibration and noise

Lennox 99K39 Expansion Valve L99H008 Direct OEM Fit: Engineered forAs a veteran HVAC technician, I know that maintaining precise refrigerant control is the difference between a high efficiency system and a compressor failure. The Lennox 99K39 Expansion Valve is a genuine OEM replacement part designed for accurate metering in residential and commercial cooling systems. This Thermostatic Expansion Valve (TXV) utilizes a 3 8 inch inlet and a 1 2 inch outlet to regulate liquid refrigerant flow into the evaporator coil.