"Cooling Fan Manufacturer" overhead mounting structure is typical of the many sheet-like cooling fins, to engage in a process having a certain thickness on the bottom of the endothermic, by a radiator fan mounted on top of diversion, by making the air gap on the heat sink, and thus heat away. "Cooling Fan Manufacturer" Disadvantages: airflow over the heatsink needs to change direction, easy to form a "no wind zone" and the overhead of a traditional axial fan, which is easy to form between the bearing portion dead - "Wind blind spots", can be chosen. "Cooling Fan Manufacturer"the center of the heat sink is in contact with the heating device (CPU core, etc.).