Stationery mechanical welding smoke filter is ideally suited for use at fixed welding workstations, in welding cabins and training workshops. The extracted air is first fed into a pre-filter where large airborne particles are captured. Then the air is brought through the main filter, where the welding smoke is cleaned with a filter efficiency rating above 99.9 %. This means that even the smallest particles down to a size of 0.3 micron are filtered.