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19" rack equipment dimensional data

As specified by BS5954 (1980) and IEC 297 (1975).

Rack opening width: 450mm
Between fixing centre: 465mm
Between rack outer edge faces: 486mm
Recommended equipment front panel width: 483mm (19 inches)
Recommended equipment body width: 449mm (maximum)
1U incremental height: 44.45mm (1.75 inches)