Our standard reverse pulse cartridge dust collectors trap 99.7 percent of dust particles as small as 0.5 microns. A High Efficiency Particulate Air (HEPA) filter captures 99.97 percent of the remaining dust particles (down to 0.3 microns). Our freestanding HEPA filter connects to any existing Clemco Reverse-pulse dust collector, and our top-mounted HEPA filters work with the Pulsar all-in-one blast cabinets.