Breathing in sawdust can be hazardous to your health. Palmgren has developed an economic solution. This 650CFM dust collector is portable, simple to use, and powerful with a 3/4HP motor. The unit comes with a 4 diameter by 6-1/2' flexible hose, you can connect with any woodworking tool (adaptors may be required) and reduce the dust particles in the air. The 5 micron upper bag (known as a filter bag) filters the air as the sawdust is collected. Once the unit is turned off you give the upper bag a little shake and most of the dust settles in the clear poly collection bag. The clear collection bag lets you know when it is time to empty.