The right Network Cabinet size is determined by three key factors: total rack units (U) required, equipment depth, and future expansion capacity. In most business environments, choosing a cabinet with at least 20–30% extra rack space prevents overcrowding and extends system. Any reason why I should NOT put a wall-mount network rack on a shelf within a cabinet? I'm looking to a build a network/server cabinet - but I'll be building it within in-built cabinetry (around 600mm depth). This gives you flexibility as your network grows. Here's where things get technical, but don't worry – it's actually. There are three dimensions to consider when selecting server cabinets: cabinet depth, height, and width. From our server cabinet ranges this will determine the cabinets available.