A fanbus is something that is used to power fans or components in the computer that don´t have molex connectors or any connectors only bare wire or connectors that will not fit anywhere in the computer. It is Cliff Anderson´s invetion, and has been and still is a very useful invention. The one made here is made to be safe, later on through the article you will understand why it is made to be safe. It has voltages of 12v/7v on one side and 12v/5v on the other side.