Festool 577975 Main Filter, SYS-AIR H/HEPAThe main filter has a special TripleV shape with a particularly large surface. As a result, it can catch many dust particles and offer a higher filter performance. The advantages are less rapid clogging and a long filter service life. TripleV: Specially developed main filter in the TripleV shape with particularly large filter surface for less rapid clogging and longer service life Quick filter replacement: The main filter can be easily removed and