In the SRF K series, welding or soldering fumes are filtered with a filtration efficiency of 99.9 % before the air is fed back into the work room. The high air volume flow rate even makes it possible to extract large smoke clouds. The cleanable long life filter cartridges guarantee low operating costs over the long-term. The SRF K-15 is a more powerful variant and is particularly effective against large smoke build-ups or when extracting from two work stations at the same time