Super Sized 7.2" motor used in Hoover's early commercial equipment and central vacuums. All metal construction by Lamb features ball bearings on both ends. Motor is 120 volt w/ground. Bypass exhaust through its horn known as tangential. 3 bolt points. Stands 7" tall. Built in suction seal ring on bottom. Superior suction power. Lamb #115937/116119 dda 4.25.18