When dealing with rack mount cabinets, be aware that each shelf takes up the space of 5 U’s inside the enclosure. This helps to determine the size of cabinet you need for your equipment.
Remember that computers produce a significant amount of heat when operating and dissipating this heat becomes a critical issue when attempting to store multiple computers inside of a single cabinet. Take this into consideration when purchasing a server rack cabinet.
If your equipment requires protection from submicron contamination, be sure to have a HEPA filter installed in your cabinetry.