Abstract: The invention relates to an arrangement for cleaning a wool chamber in the manufacture of mineral wool. In the manufacture of mineral wool a binder is added to the stream of fibers which is deflected towards the wool chamber and the binder deposits itself in fine droplets in the fibers. The binder-laden fibers which touch against the walls and roof of the wool chamber adhere to them because the binder hardens upon contact with the hot surfaces. Gradually a hard deposit of binder and fibers is formed upon the walls. According to the invention cleaning of the walls is substantially simplified by means of making the walls and/or roof of a double walled construction, perforating the inner walls and applying a reduced pressure in the cavity between the walls holding a detachable lining against the inner walls by means of suction.