the Lennox 26H61 Damper Switch is a critical component for ensuring the HVAC air damper is positioning correctly within the ductwork

facilitating communication between the sensors and the firing mechanism

this valve ensures stable modulation and tight shut-off in demanding hydronic applications

Is the BLW1321 compatible with systems using the legacy BLW0572

providing a reliable mechanical barrier in commercial and residential split systems

York S1-7970-3281/A Limit Switch 320819-301 the Lennox 26H61 Damper SwitchThe York S1 7970 3281 A Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This high limit cutout switch features a 145F Open (FOP) and 115F Close (FCLS) configuration, ensuring the furnace heat exchanger remains within safe operating parameters. Acting as a normally closed thermal disc, the S1 7970 3281 A interrupts the burner circuit if airflow is restricted or