The Rheem-Ruud 51-108728-101 is a 1/2HP electronically commutated motor (ECM) designed to deliver efficient, variable-speed airflow in compatible HVAC systems. Operating on 208-230V single-phase power with a 48-frame design, it uses electronic controls to adjust motor speed according to heating and cooling demands. This motor is commonly used in Rheem and Ruud air handlers and furnace... https://www.partshnc.com/51-108728-101-rheem-ruud-12hp-208-230v-1ph-48-ecm-motor