... Air purification CE/ISO/UL/ROSH Vacuum cleaner filter is Widely used as the pre-filtration and single-stage filtration in the ... internal combustion engines.Excellent chemical fiber nonwoven used as the filter core materialABS, PP, PC, PVC plastic frame, or two part ... life (washable), economical, utility, easy to install.Filtration efficiency class: G3, G4, F5, F6, F7, F8 Portable Of Vacuum Cleaner ...