What does a colo server cabinet height include?

The interal height of a server cabinet is measured in U where 1U = 44.45mm. The overall height provided in the specifications is the total height of the outer cabinet including the castors. Care should be taken to note this height when planning and installation to make sure that the server cabinet can be manoeuvred into space from the delivery wagon with consideration given to doorway and lift widths, depths and heights.