this OEM part is engineered to disrupt the ignition circuit if excessive heat is detected near the burner tray

The Marley Engineered Products 4520-2018-003 Limit Switch is a critical safety component engineered for forced-air heating applications where precise thermal protection is non-negotiable

preventing system acidification and compressor failure

This filter provides excellent static pressure management

The 143-82-021-02 is the current manufacturing designation used by Sensus for the Green/Black 6"-14" w

Lennox 57W75 Limit Switch this OEM part is engineeredPrecision is critical in furnace safety circuits, and the Lennox 57W75 Limit Switch is the standard grade solution for managing thermal thresholds in high efficiency systems. As a 250F CO M R Limit Switch, this component is engineered to interrupt the burner circuit when temperatures reach the 250 degree Fahrenheit cutoff, requiring a manual reset to ensure a technician inspects the underlying cause of the overheat. This OEM part is the direct