How do I choose the right size data cabinet?

Data cabinets are measured in "U" (Rack Units). 1U is equal to 1.75 inches in height. count the equipment you plan to rack (switches, patch panels, servers) and sum up their U-height. We recommend buying a cabinet with a little extra space (e.g., if you need 9U, buy a 12U cabinet) to allow for future expansion and airflow.