TripleV: Specially designed main filter in a TripleV shape with an exceptionally large filter surface 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 99.995% filtration in dust class H/HEPA. 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 H/HEPA, meaning it is effective against highly hazardous and carcinogenic dusts.