-Washable, 1 Micron Filter Bag As an added value, a 1 micron bag is supplied standard equipment, which gives you superior filtration. -1 HP TEFC Induction Motor Totally enclosed, fan cooled, permanently lubricated motor, provides high performance for long lasting use and dependability. -Keyed Type Safety Switch Keyed switch is removable for additional safety and to prevent unauthorized use. -Precision Spin-Balanced Impeller The steel impeller is balanced and curved for optimum air velocity, noise reduction and protection to minimize wear. -Built-in Casters Heavy duty construction base, mounted on four swivel casters provides excellent maneuverability and total portability from machine to machine.