When the time comes to start shopping around for new server racks, keep in mind the fact that as you are looking at the different models, size definitely counts. In the IT equipment industry, you will find that the standard height for a server rack is 42U with each U measuring 1.75 inches thus the rack is 73.5 inches tall. You need to try and stick to units that meet industry standards unless you have a very specific reason not to.
Server Racks Offer Two Different Widths and Depths
In the IT industry you are going to find that there are two standard widths for server racks, the narrowest ones measure 19 inches and are more for computer and entertainment industry use. The wider 23 inch racks are intended more to be used in the heavy telecommunications industry usage. For many years the average depth for server racks was 20-25 inches, with the introduction of the blade server in recent years, new racks measuring 35-42 inches deep have become very common.