Application video with KEMPER room ventilation with displacement ventilation for the extraction of welding fumes on the premises of Claas Saulgau GmbH, Bad Saulgau, Germany. The rising polluted air is collected via inlet pipes at a height of 4 to 6 metres. Source outlet pipes near the floor return the warm, filtered air back into the room with little impulse. The pipes are connected to the central extraction and filter system. The cleaned clean air exits the source outlet pipes near the floor with low impulse.