The Amana-Goodman B1370150 SPST Air Pressure Switch ensures safe and reliable furnace operation by monitoring airflow and proving proper draft conditions before ignition. Designed for Amana and Goodman gas furnaces, it activates at a 0.85" WC pressure setting to prevent system operation under unsafe venting or airflow conditions. https://www.partshnc.com/085pf-spst-pressure-switch-goodman-b1370150