At least one constructional element is in the form of a free-standing, vertical, enclosed rectangular frame (1) with a Z or S-shaped profile. A chassis extending at right angles to one plane of the frame is positioned on the underside of the frame. An adjacent frame is attached by a corner connection. The frame has two longitudinal hollow struts (2.1,2.2) with grooves or ridges for fixing the functional units at any height, and joined by two transverse brackets (3.1,3.2) Cables and or pipes are contained in ducts in the frame.
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