CDCLarue 500 series vacuums are the only portable Hepa certified vacuums with patented Pulse-BacŪ Automatic Self-Cleaning Vacuum Control Technology. These vacuums are ideal for collecting dust and debris generated by hand held tools used to cut, grind and sand or for general jobsite clean up. Dual Hepa filtration system captures 99.97% of dust particles .3 micron and larger.