JET AFS-400 Air Filtration System Remote control has built-in timer with 1, 2 and 4 hour settings; automatically shuts system off at the end of the time setting Select from three speeds 260, 362, 409 CFM for the most efficient air filtration Disposable electrostatic outer filter attracts more dust particles than standard filters Inner pocket filter is removable for cleaning out with ease Rubber-Feet prevent marring of surface when placed on workbench