Festool Main Filter HF-SYS-AIR Mfor SYS AIR Functions Innovative filter shape. The main filter features a unique TripleV shape with an enlarged surface area, allowing it to capture more dust particles and deliver superior filtration performance. This design reduces rapid clogging and extends the filter's lifespan. It is suitable for effectively handling materials like wood dust. TripleV: The specially designed main filter optimizes performance in compact spaces. This design reduces