The Dust Right 1200 system reportedly removes up to 98% of 5 micron particulate and 85% of 1 micron particulate, improving the safety and healthfulness of workshop air. The system comes with a three-speed, 1/3-hp motor that filters up to 1185 cfm, cycling the air in a 20x20-ft. room in less than three minutes. It can be operated continuously or set, with its built-in timer, for 2, 4, 6 and 8 hour intervals. Hanging the system from the ceiling joists, according to the manufacturer, saves space and is operated easily with the remote control. (877) ROCKLER, Rockler.com.