The Armstrong Furnace R107025-01 is a reliable 1-phase blower motor for efficient airflow circulation in residential HVAC systems." It produces a consistent 1/5 horsepower (HP) rating when powered by ordinary home current (208-230 volts AC) at 60 Hz. This leads to a balance of silent operation and enough power to circulate air around your home. https://www.partshnc.com/r107025-01-armstrong-furnace-208-230v1ph-15hp-1075rpm-mtr