the Lennox Y4151 is the official manufacturer-designated direct replacement for part number 46M99

This kit enables a seamless transition by adjusting the manifold pressure and orifice sizing to accommodate the higher BTU density of LP gas

this motor is built to withstand 40°C ambient temperatures in commercial or residential fan and blower assemblies

Whether you are troubleshooting air temperature fluctuations or a complete system lockout

Mitsubishi Electric E22851640 Expansion Valve 320074-702 the Lennox Y4151 is theThe Mitsubishi Electric E22851640 Expansion Valve is a critical OEM replacement part designed for precision refrigerant metering in advanced HVAC systems. As a linear expansion valve (LEV), this component utilizes a step motor drive to modulate refrigerant flow with high accuracy, ensuring the evaporator maintains optimal superheat levels across varying load conditions. For technicians servicing Mitsubishi Electric heat pumps and mini split air