Mobile mechanical welding smoke filter offers many advantages for use at changing welding workstations. This filter is available in various lengths such as 7.0 ft., 10.0 ft. and 14.0 ft. The extracted air is first fed into a pre-filter where large particles are captured, then through a 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.