While Buna-N offers excellent resistance to oils and gases

replacing it with a manual reset version can lead to improper system cycling and safety issues

the 36-inch tube features a cross-sectional design with precisely drilled holes that must face the airflow for optimal performance

and L1RA furnace series

Industrial Strength: Built to withstand the high-temperature environment found within modern heat exchanger cabinets

York S1-024-35309-000 Pressure Switch While Buna-N offers excellent resistanceThe York S1 024 35309 000 is an OEM specified air pressure switch designed for combustion air proving in high efficiency gas furnaces and packaged units. This furnace pressure switch features a SPNO (Single Pole Normally Open) contact configuration and is factory calibrated to a set point of . 35 inches Water Column (WC). Engineered to monitor the differential pressure generated by the inducer motor, it ensures the combustion blower is drawing