Specifically designed for use with our filter cleaning system Tact, the flat pleated Safety/HEPA filter made of PES fiber material with a double PTFE coating allows for the suction of large amounts of fine dust, coarse dirt, and liquids, even without a filter bag when necessary. Certified for dust class H, the filter has a dust separation efficiency of 99.995 percent, making it suitable for vacuuming health-threatening dusts. However, the use of a safety filter set or a disposal bag is required for this purpose. To prevent confusion with other filters, the rot-proof and moisture-resistant Safety/HEPA filter features a red label. Compatible with all single-motor NT-Tact and Ap models from Kärcher.