Abstract: A holding base for a radiator assembly includes a frame, at least a secure part and at least a threaded part. The frame is attached to a circuit board and provides a space for receiving a heat generating component on the circuit board. The secure part provides an elongated projection rib at two lateral sides of said frame and provides an engaging block at the middle of the projection rib for engaging with the first type radiator assembly. The threaded part is disposed at the frame for being joined to the second type radiator assembly with a threaded fastener.

Abstract: A method of manufacturing an air duct is provided. First, a plastic material is heated until the plastic material is melted. Next, the molten plastic material is sucked into a mold and then the molten plastic material inside the mold is cooled to form the air duct. Finally, the air duct is removed from the mold. The air duct comprises a housing including passageway for air to flow there-through, a first air inlet/outlet formed on a side thereof, and a joint portion formed on another side thereof corresponding to the first air inlet/outlet to fix to a fan. The joint portion has a second air inlet/outlet. When the fan rotates, airflow is generated, which carries the heat generated by the operation of the devices via the second air inlet/outlet and then exits out via the first air inlet/outlet.