Cabinet 4u size
A rack unit (abbreviated U or RU) is a unit of measure defined as 1+3⁄4 inches (44. It is most frequently used as a measurement of the overall height of , as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed as multiples of rack units. For example, a typical full-size rack cage is 42U high, while equipment is typically 1.
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