Mobile cartridge filter unit provides superior protection against harmful high-alloyed metals and damaging dust. It works on the principle of surface filtration. Captured dust-particles cannot penetrate the filter media due PTFE membrane, which is laminated directly on the filter surface. The unique microstructure separates even the smallest particles like powdered dust (particle sizes between 1.0 and 0.1 µm) with remarkable results. The unit is therefore especially suited for the extraction of welding smoke. The cartridge filter unit also features an automatic cleaning cycle. An integrated control monitors the surface of the filter media and activates a necessary cleaning. The harmful substances are collected in a dust collecting bin and can easily be disposed.