Honeywell BA20149 1752D5 Furnace Air Pressure Switch, finished in black and white, is a pressure-sensing device used in furnace systems to monitor air pressure in the combustion venting pathway. It is rated at 1.25 inches of water column (1.25-Inch WC), defining the pressure threshold that activates the switch. The BA20149/1752D5 configuration identifies this exact model and variant.
