elements comprise in the sequence from top to bottom an upper sheet metal panel an upper glass panel for the arrangement of lights having a height of approximately 1 m for example a central sheet metal panel a lower glass panel having a height of approximately 1 6 m for example and a lower sheet metal panel the glass infill panels of the side walls 154 preferably consist of single pane safety glass the glass infill panels and the sheet metal infill panels are screwed or clamped into seals in such a way that cleaning media used for cleansing the booth cannot penetrate outwardly therethrough and such that the infill panels are prevented from falling out in the event of fire the lights envisaged for the upper glass panels of the side walls 154 comprise asymmetrical reflectors and sheet metal housings which are pressed onto the glass panels externally the lighting housings can be provided with adjustable fixing devices and clamping devices with safety chains or a suspension device as well as a seal against the glass sheet the lighting for the booth is controllable locally by means of a lighting cabinet a drive rail 156 extending in parallel with the longitudinal direction of advancement 108 for an automatic pre treatment unit 158 that is movable in parallel with the longitudinal direction of advancement 108 is arranged on the lower sheet metal panel the automatic pre treatment unit 158 may in particular be in the form of a pre treatment.