Ulpa filtration (Ultra Low Penetration Air) 99.999% efficiency on particles as small as 0.12 microns. Ideal for cleaning floors, walls, table tops, and for cleaning around process machines. Ready to use: the CR- 4D comes complete with Ulpa filter and tool kit. High density polyethylene recovery tank ensures excellent corrosion resistance. Tool Kit includes 10' hose (static dissipative), 2 each extension winds, PVC crevice tool, PVC flat tool, round brush combo, Floor tool and paper bags (5).