I have a down draft extractor in my kitchen. De Dietrich. The extractor works fine. However, the movement mechanism which takes it down into the recess in the platform, stops about 3 inches off from the platform. The movement then comes back to starting position. It is possible there is some dirt or obstruction in the movement mechanism. Needs investigation and fixing. First 2 photos are the extractor in fully open position. The third photo is the lowest level to which it goes into the recess and the point at which it starts going back up again.