Heatco HMES2089-0308 Pressure Switch 1.1+/-0.5

The Heatco HMES2089-0308 Pressure Switch is a differential air pressure control part used to monitor airflow or combustion draft conditions. It operates within a calibrated range of approximately 1.1 inches of water column, with a tolerance of 0.5, and responds by opening or closing an electrical circuit when pressure conditions fall outside the set threshold in HVAC systems. This switch is installed in furnaces, air handlers, or venting systems during servicing or assembly, where it helps ensure proper airflow verification and safe equipment operation. It supports reliable system performance in residential and commercial applications.