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A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, 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 ...
A full-height rack cabinet. A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is 19 inches (482.6 mm) wide.
The height of rack rail is determined by the number of rack units required for mounting the equipment. The design of racks and rack rails is specified in ECIA - EIA/ECA-310. Each rack unit (U) is equivalent to 1 + 3 ⁄ 4 in (44 mm). Most rack rail is in sizes from 2 units high (3 + 1 ⁄ 2 in or 89 mm) to 54 units high (78 + 3 ⁄ 4 in or ...
When hanging shelves on a wall, home designers generally try to ensure that the shelf should be no wider than 1.4 x bracket's width and no wider than 1.2 x bracket's height. [ citation needed ] Spacing brackets for a long shelf should be no more than 4 x shelf-breadth between each bracket - this holds true for normal materials used at home.
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A section of rail from a 19" server rack unit, showing how typical rack units 1U through 4U are distributed among the mounting holes. Date: 6 August 2007: Source: Own work, based on the public-domain image Server-Rack-Rail-Dimensions.gif at en.wikipedia: Author: Sakurambo: Permission (Reusing this file)
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