PURISYSTEMS 3-SPEED REMOTE AIR FILTRATION SYSTEM, PURICARE 500 HANGING AIR FILTER W/RF REMOTE FOR WOODWORKING, GARAGE AIR PURIFIER, SHOP DUST COLLECTOR, UP TO 500 SQ. FT(500 CFM)Compact High performance Dust CollectorProper control of dust is paramount for continued good health, and essential in any workspace or shared area. This air filtration can be set to operate at 3 stage speeds, 350 450 500 CFM (HI), they will create a circular airflow and work more efficiently which say goodbye to the film of fine dust all over everything, woodturning, sanding, sawing etc and air quality definitely improved. 2 Stage Filtration