... cleaner filter is Widely used as the pre-filtration and single-stage filtration in the air systems of household vacuum cleaners, industrial vacuum ... core materialABS, PP, PC, PVC plastic frame, or two part PU adhesive as the frame end coverFigures of column and squareness, etcLarge filtration ... install.Filtration efficiency class: G3, G4, F5, F6, F7, F8 Portable Of Vacuum Cleaner Filter