Compatible with all single-motor NT Tact and Ap models from Kärcher and made from cellulose fiber material: The Dry flat pleated filter impresses with a dust separation efficiency of 99.9 percent, certifications for dust classes L and M, and is suitable for safely vacuuming dry fine dust and coarse dirt. To avoid confusion with other filters, the Dry model features a green label. If liquids are vacuumed, the filter must be dried after use to maintain its suction performance.