ULPA filtration 99.999% efficient @ .12 microns in accordance with IEST-RP-CC0007. Static conductive components suppress static electricity. Radio frequency interference suppression (RFI). Electro magnetic interference suppression (EMI). Electro static discharge (ESD). Conductive vacuum hose and tools. (2) 3" swivel casters. (2) 8" ridged wheels. Weighs 65 lbs.