Acer AT350 F2 Acer AT350 F2 Server Service Guide - Page 139

125 Vertical mounting hole pattern The four vertical rails of the system rack contain mounting holes arranged in a manner shown in the figure below: The system occupies 5U in the rack. Count the U positions and hole numbers from the bottom up. The distance from the center of two holes with closer spacing to the center of the next pair is equivalent to 1U. Note: The unit of measurement used in this guide is "U" (1U = 1.75 inches or 44.45 mm). The total sum of the heights of all components in the rack measured in "U" cannot exceed the height of the rack. For more information, refer to the documentation that came with the system rack. When installing components, you must start your measurement from the center of the two holes with closer spacing. Otherwise, the screw holes on the component may not match those on the rack.