In a fan housing, a surrounding wall extends uprightly from an inner surface of a base wall that is formed with a wire hole. A power wire, which is coupled to a fan motor mounted on the inner surface, extends through the wire hole. A wire-positioning unit includes a first positioning groove formed in an outer surface of the base wall and extending from the wire hole to the surrounding wall, a second positioning groove formed in an outer surrounding surface of the surrounding wall and extending from the first positioning groove such that the power wire extends along the first and second positioning grooves, a first anchoring member for anchoring the power wire in the first positioning groove, and a second anchoring member for anchoring the power wire in the second positioning groove.