The IT servers used within server rooms, datacentres and IT networks generate heat. The amount of heat an IT server generates depends upon the level of utilisation (loading) and the energy efficiency of the server design. Within a confined space, such as a server rack cabinet, heat levels can rise to damaging levels and present a fire risk. Typical server racks can see power demands of up to 30kW and the need to cool or dissipate up to 5kW or more of excess heat. Air conditioners and cooling systems are used to reduce the heat within server racks and also the room in which the rack cabinets are installed.