If you are in the market for new server racks, you need to keep in mind that when you are looking at the different models, size definitely counts. In the industry, you will find that the standard height for a server rack is 42U with each U measuring 1.75 inches. It is highly recommended that you try to stick to units that meet industry standards unless you have a very specific reason not to.
Width and Depth Vary with Server Racks
There are two standard widths when it comes to server racks, the narrower ones measure 19 inches and are more for computer and entertainment industry use. The wider 23 inch racks are more for heavy telecommunications industry usage. Up until recently the average depth was 20-25 inches, but thanks to the introduction of the blade server, those measuring 35-42 inches deep are very common. The best way to find out what size racks you need is to measure all of your equipment before you order.