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According to the layer ventilation principle, the smoke is collected via a piping system at the hall ceiling and sucked into the extraction system. The dust is filtered from the air sucked into system and cleaned air is either returned clamped into the hall through the piping system or directly blown outdoors. By sucking away the warm air at the ceiling of the hall and returning it in the lower area of the hall, an even temperature distribution is achieved what lead to energy cost savings up to 25 %.