This 1/2 HP air filtration system creates the most air flow with 3 different speeds. The 560, 750 or 1000 CFM will clean a 20 x 20 x 8 ft. shop 22 times/hour. For larger shops, it is recommended to use two of these units. The unit includes fuse overload protection. Comes in a sturdy 20 gauge steel cabinet w/quick release latches for easy filter changes. Three timer settings on unit or remote control. Replaceable inner and outer filters and eyebolts for easy installation.