There are many things to consider when you are picking out your server rack. One of the main things you need to look into when purchasing a server rack are the built in cooling systems, as well as proper airflow provided by the server rack. Server racks are designed to take in cool air and blow out the hot air. Features such as rack mounts or server rack doors can help reduce the amount of heat generated by the hardware by creating more space for the hot air to blow out as well as preventing any heat from getting trapped in the server room.
If the hardware you are using is constantly in use and produces a lot of heat there are many other options to cool down your hardware such as server cabinets with built-in fans as well as custom server racks with extra cooling systems. It is also important to ensure there is a good balance of hot and cold. A lot of server racks come with steel panels at the front and rear doors, in order to ensure safety and security in case something happened such as in the case of a fire, the data on the other servers would be kept safe from it.
Another important thing to consider is not to overload your servers with power. You need to find out what amount of power distribution your server requires, because overloading it can not only damage it but can also completely destroy it, and even if there does not appear to be any damage to the server, there could be some long term damage. A typical power requirement is 15 to 20 amp made to fit within a server rack vertically or adapter as a rack mount powerstrip. Although depending on the size and the hardware you need to make sure that your server and hardware has enough power as well, because if it does not have a sufficient power supply there is a big chance your server will have a lot of downtime.
Sometimes there is a need to access and change the amount of power distribution for the server or any other hardware, a device called PDU (Power distribution unit) is used for that very purpose. Most Quality PDUs allow you to remotely access and change the range of the amps between 15 to 30, for when you are planning to add more hardware or expand the existing ones.