Drive In: Drive in rack is another high density storage option in which the lift truck drives inside the storage rack and places the pallets on load rails. Drive in systems can range from 2 all the way.
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[pdf] People often label their rack by its specific height, such as “42U server racks” or, much more informal, “7-foot racks.” the “U” in “42U” is stands for “rack units,” or “ U-spaces,”.
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