POWERTEC AF4000 3 SPD Air Filtration System, 300/350/400-CFM Powerful, quiet, efficient, and potent air filtration system Easy to replace filter; no tools required; Outer filter: 5 micron; Inner filter: 1 micron 3 speeds: 300/350/400 cfm Infrared remote control system; 3 timer setting: 1hr/2hr/4hr Including hooks, hardware and chains for hanging