This Ametek Lamb Vacuum Motor is a 5.7" / 2 Stage Vacuum Motor. The Ametek part# 122176-18. Double-stage tapered fan system, 8.4" / 213 mm diameter, Improved sound quality, "True" tangential discharge bracket, 120 volts AC, 3.5" High-Efficiency lamination, Double ball bearings; 10mm output. Great for Commercial and Residential Central Cleaning Systems, Car wash vacuum and blower systems, Equipment operating in environments requiring separation of working air from motor ventilating air. Designed to handle clean, dry, filtered air only. 1500+ hours life (Infinity Brush) with 670 Peak Air Watts and Up to 45% Overall Efficiency. Comes with a High efficient cooling system and a Lamb "Green Power Label". It's UL recognized, category PRGY2 (E47185) with a CSA certification pending