OEM Rheem RUUD Furnace Air Pressure Switch Replaces 42-22905-06 1.80
The Rheem/WKing/Corsaire/RUUD Part # is 42-101477-06 (also 42-101477-86 42-22905-06 and IS20353-5655) and It’s rated at 1.80″ W/C. An air switch is safety designed to ensure that your inducer motor is running at the proper RPM, and creating the proper vacuum for your furnace to flue safely.