The DELTA 50-720 1 HP Dust Collector uses its powerful motor to extract dust created by various machines with four-inch dust collection ports. The dependable one HP TEFC induction motor runs at 3,450 RPM and powers the curved steel impeller for maximum air velocity (650 CFM). The 50-720's one micron top filter bag filters fine dust, and the clear disposable bottom bags give you the convenience of just tossing them when they're full. Thanks to the finned aluminum motor housing, this unit runs ultra-cool during long periods of use. The four swivel casters make it easy to move this dust collector from machine to machine quickly.