<p>The box (1) has wall units (2-5) connected with each other. A cover (6) locks free ends of the wall units and together with the units form a receiving space (9) for receiving a roller shutter (10) or a Jalousie. A roller-shutter shaft (7) is rotatably arranged in the cover. The roller shutter or the Jalousie is connected with the shaft by a spring (8). The cover has an integrally formed blocking unit (11) at its side pointing into the receiving space. The locking unit is arranged parallel to the wall units.</p>
