Trolley-mounted filter for extraction and filtering of welding fumes, gases, vapours, aerosols. The CLEANING NO-SMOKE filter is realised with a painted sheet panelled structure provided with a plate with connections for the extractor piping or for the UNIVERSAL NO-SMOKE (Standard) or EVOLUTION NO-SMOKE (Optional) free-standing arms. The polluted air is extracted through the air vent due to the effect of the vacuum created inside the casing by the centrifugal extractor fan.