A cooling fan including a fan module, a microcontroller, and a bus interface. The microcontroller is coupled to the fan module and is capable of adjusting a speed of the cooling fan based on a status of a second cooling fan and adjusting the speed of the cooling fan based on a temperature detected. The...http://www.google.co.uk/patents/US6725132?utm_source=gb-gplus-sharePatent US6725132 - Intelligent cooling fan
