The RB900 is a very high quality 2HP cartridge-style 900 CFM dust collector. This heavy duty dust collector is built entirely from 12 gauge steel and is 100% hand welded. This means it has no seams that can leak dust. The pleated cartridge filter is loaded from the top of the blast cabinet which is a very unique design that ensures a tight seal. Cleaning the filter is accomplished automatically by a reverse pulse system that has a digital timer which pulses the system at a preset interval. This insures that the filter is functioning at its highest level at all times. The sump is then emptied from the bottom of the collector.