Ametek Lamb 5.7 Inch 120 Volt 3 Stage B/B Tangential Bypass Motor 119797-19. 5.7 Inch 120 Volt 3 Stage Double Ball Bearing Tangential Bypass Motor. Description: Three stage. 120 volts. 5.7 Inch/145 mm diameter. Double ball bearings. Single speed. Tangential bypass discharge. Aluminum fan end bracket. Aluminum commutator bracket. Design Application: Equipment operating in environments requiring separation of working air from motor ventilating air. Designed to handle clean, dry, filtered air only. 120 Volts, 50/60 Hz. FF6. Manufacturer Part Number: 119797-19 SC-119797-19