preventing whistling and performance drops associated with air bypass

making it ideal for standard building automation applications

facilitating quick field installation in tight furnace plenums

this unit features a factory-broached 1/4" x 1/8" keyseat specifically sized for a 1 1/8" shaft to ensure standard ANSI compliance

York S1-025-36115-001 Switch Els PW 17895 preventing whistling and performance dropsThe York S1 025 36115 001 Air Proving Switch is a critical safety component engineered for York HVAC systems, including packaged rooftop units and residential furnaces. As an HVAC air pressure switch, it functions as a differential pressure sensor, monitoring the supply fan to ensure sufficient airflow before allowing ignition or cooling stages to engage. This OEM replacement part is built with a NEMA 1 electrical enclosure and is compatible with R