Application video with KEMPER push-pull hall ventilation for extracting welding fumes in the mixed ventilation method in use on the premises of Buitenhuis Containerbau, Staphorst Netherlands. Inlet and outlet pipelines are mounted opposite each other in the hall and connected to an extraction unit and a filter unit for capturing welding fumes. The hall ventilation system is suitable for halls in which a point extraction system is impossible or it is being used to complement point extraction systems.