Festool 577968 HF-SYS-AIR M Main Filter features an innovative TripleV shape that significantly increases the surface area of the filter, allowing it to capture more dust particles and provide superior filtration performance. This unique design helps reduce rapid clogging and extends the filter’s lifespan, making it highly effective for filtering wood dust and other airborne particles. The filter is designed to fit compact spaces without compromising efficiency, ing a filtration efficiency of over 99.9% to ensure cleaner air. Additionally, the main filter is easily accessible, allowing for quick removal and to maintain optimal performance. Model Number: 577968