HafcoVac's Combustible Dust Vacuums run on compressed air and are intrinsically safe and 100 percent grounded for any OSHA Classified Hazardous Environment, says the company. The HafcoVac is portable on top of 30- or 55-gallon drums. It is up to five times more powerful than electric vacuums, adds Hafco. HafcoVac Combustible Dust Vacuums have no moving parts and come with a lifetime warranty.  HafcoVac can operate on compressors as small as 5 HP, says the company. All vacuums are manufactured in the USA.