TripleV: Specially designed main filter in a TripleV shape with a particularly large filter area for slower clogging and longer lifespan. Quick filter change: The main filter can be easily removed and installed without any tools. Healthier work environment: Over 99.9% filtration in dust class M. The main filter features a unique TripleV shape with a particularly large surface area, allowing it to capture many dust particles and provide higher filtration performance. Benefits include slower clogging and a long filter lifespan. The filter is suitable for dust class M, meaning it is designed for health-hazardous dusts such as wood dust and mineral dust.