What is Rack Unit (RU)

Rack Unit (RU) is a measurement used to define the height of equipment within a rack enclosure.

One RU is equal to 1.75 inches (44.45mm) and is used as a standard measurement for server and networking equipment.

The height of a piece of equipment is often expressed in terms of the number of rack units it occupies, with 1U being the most common size.

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