Cabin for spray-coating workpieces with material in powder form

A booth for the spray-coating of workpieces with powdery coating material, comprising a booth interior defined by walls, a booth floor and a booth ceiling, said booth interior having a specific longitudinal axis and interior cross-sectional contour, in a direction of which the workpieces are movable into or through the booth, a cleaning device which is movable in the booth interior in a direction of movement along the longitudinal axis, and a vacuum source connected to the cleaning device, the cleaning device comprising a rigid carrier which is equipped with mechanical cleaning elements, which, during the working movement of the cleaning device, bear flexibly at least against parts of the interior cross-sectional contour of the booth interior, wherein the cleaning device is dimensioned so that a working gap is left between the carrier and the interior cross-sectional contour that is bridged elastically by the cleaning elements and wherein the cleaning device through a connection to the vacuum source sucks away powder material released from the booth interior walls by the cleaning elements.