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The layer-blow ventilation principle are used in large halls with a span of > 25 metres, system represents combination of push-pull and mixing (diluting). All benefits of the individual systems are presented in one system. The smoke is sucked in via a piping system at the ceiling, air is cleaned and blown back into the hall. When clean air flows in and welding fumes rise up, not only the optimised extraction rate is achieved, but additionally also a thermal effect. Even large halls can be extracted with low energy introduction here.