Open server racks have more space and flexibility and allow cable accessibility usually from the top. Since they are not locked, they are often found inside secure server rooms. When building small server racks, do I need to leave space in between the servers? I would argue that this is not necessary, since servers are cooled front to back. One example is three servers and one switch. I would just put everything on top of each other and fill the remaining space with. While server racks are engineered to support mission-critical, heat-intensive computing environments, network racks prioritize cable routing, switch management, and patch panel accessibility.