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But you also need to consider the external width of the. rack. The standard width for rack enclosures is 24 inches or 600 mm, which corresponds to the standard for removable floor. tiles in a raised-floor data center. Extra-wide rack enclosures (30 inches or 750 mm) are also available, with or without extra.
The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame; the width of the equipment that can be mounted inside the rack is less.