Designed for fine or difficult powders, VAC-U-MAX Model 110MFS portable industrial vacuum cleaner has 80 percent more suction power than most other vacuums in the 5HP class. It features a standard PTFE leaf-style filter rated 99.9 percent and has an aggressive manual filter shaker that prevents filter blinding. VAC-U-MAX,www.vac-u-max.com, (800) 822-8629.