Suitable for CT 26, CT 36, CT 48 and TURBO II Dust Extractors The Festool 496170 HF-CT 263648 Main Filter is suitable for select mobile extractors. The main filter made of cellulose fibre material is suitable for vacuuming fine dust and coarse dirt of dust classes L and M. This enables work to be carried out efficiently, cleanly and systematically and reduces hazards to health. Filters residual dust not retained by the filter bag so that clean air is directed back into the room. Please note that this is not suitable for mobile dust extractors with AUTOCLEAN function