STONEKOR carries Pulse-Bac industrial HEPA vacuums, including several HEPA certified models, with a filter fractional efficiency rangin from 98.00% to 99.99% and CFM flow rates from 140 up to 812. These vacuums use Pulse-Bac® Automatic Pulse-Clean Technology, a revolutionary design in vacuum filtration that automatically flushes the filters clear while you work, using only ambient air and vacuum. This patented technology stops the filters from facing with dust or debris and clogging during operation. Maintain peak performance with NO BLOWERS, SHAKERS, COMPRESSORS or BUTTONS to push. Just turn it on and go to work, Pulse-Bac® technology does the rest.