A colour change system for a powder coating facility, comprising: a plurality of powder containers, each powder container holding one of a plurality of different coloured coating powders; a conduit for conveying coating powder from one of the powder containers to a coating applicator; a suction unit (18, 70, 80) connected to the conduit and having an end-piece with an inlet opening into which coating powder is drawn, wherein the suction unit (18, 70, 80) comprises an inducer (75, 86) in the end-piece adjacent to the inlet opening of the suction unit (18, 70, 80), and wherein the inducer (75, 86) comprises an air nozzle (74, 85) and a venturi tube section (76, 87); a cleaning unit; a translation mechanism (28, 30, 32) for moving the end-piece of the suction-unit; and a controller, wherein: each of the plurality of powder containers has an opening in an upper surface into which the end-piece of the suction unit (18, 70, 80) can be inserted; the cleaning unit comprises a top opening for receiving the end-piece of the suction unit (18, 70, 80), a vertically oriented chamber for receiving the end-piece of the suction unit (18, 70, 80) through the top opening, a first air blowing arrangement (54, 56) for cleaning an outer surface of the conduit within the vertically oriented chamber, and a second air blowing arrangement (60, 101) for cleaning insides of the suction unit (18, 70, 80) and the conduit within the vertically oriented chamber; and the controller is configured to effect a change of coating powder colour by controlling the translation mechanism (28, 30, 32) to extract the end-piece of the suction unit (18, 70, 80) from a first powder container, to move the end-piece of the suction unit (18, 70, 80) to the cleaning unit, and after cleaning to move the end-piece to a second, different powder container and insert the end-piece into the second, different powder container. a plurality of powder containers, each powder container holding one of a plurality of different coloured coating powders; a conduit for conveying coating powder from one of the powder containers to a coating applicator; a suction unit (18, 70, 80) connected to the conduit and having an end-piece with an inlet opening into which coating powder is drawn, wherein the suction unit (18, 70, 80) comprises an inducer (75, 86) in the end-piece adjacent to the inlet opening of the suction unit (18, 70, 80), and wherein the inducer (75, 86) comprises an air nozzle (74, 85) and a venturi tube section (76, 87); a cleaning unit; a translation mechanism (28, 30, 32) for moving the end-piece of the suction-unit; and a controller, each of the plurality of powder containers has an opening in an upper surface into which the end-piece of the suction unit (18, 70, 80) can be inserted; the cleaning unit comprises a top opening for receiving the end-piece of the suction unit (18, 70, 80), a vertically oriented chamber for receiving the end-piece of the suction unit (18, 70, 80) through the top opening, a first air blowing arrangement (54, 56) for cleaning an outer surface of the conduit within the vertically oriented chamber, and a second air blowing arrangement (60, 101) for cleaning insides of the suction unit (18, 70, 80) and the conduit within the vertically oriented chamber; and the controller is configured to effect a change of coating powder colour by controlling the translation mechanism (28, 30, 32) to extract the end-piece of the suction unit (18, 70, 80) from a first powder container, to move the end-piece of the suction unit (18, 70, 80) to the cleaning unit, and after cleaning to move the end-piece to a second, different powder container and insert the end-piece into the second, different powder container.