Perhaps the "24V DC Cooling Fan" manufacturers in the three and four-wire lead is not strange, but outsiders would not necessarily understand the cooling fan wire and four-wire three-function and purpose, according to the customer in the course of their work experience in the procurement mentioned cooling fan is a three-wire and four-wire issues to share with you. "24V DC Cooling Fan" general conventional wiring is two leads are attached to the positive and negative, fans will be able to operate normally, but in some sectors due to the customer's request, there will be three wire and four-wire, says that three leads may customer access of third, first governor signal line or a temperature signal lines. "24V DC Cooling Fan" four plus two signal line is the line.