Amount of space covering by panels (5, 6, 7) comprising a rack and a panel fixing device, and comprising a folded sheet metal which has: - a support face (17) of panel carrying said device panel fixing (19); - a face of the cover (18) of the panel edge substantially perpendicular to the support face (17) of the panel; - a mounting face (13) substantially parallel to the support face (17) of the panel; - a rack face (31) carrying said rack; the face of the panel edge cover (18) being disposed between the rack face (31) and the support face (17) of the panel.
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