"220V AC Cooling Fan" frame only has a diversion effect on the air, the wind side of some of the "extra" part of the spoiler will have a negative impact on performance, the spindle bracket is an example. Arctic Cooling for this situation, launched a fan hung upside down Fan Pro Series "220V AC Cooling Fan". This series is different from the general fan motor axial fan mounted on the inlet side of the spindle bracket is also appropriate to move this side, clearing the way for sending the airflow. Nevertheless, Fan Pro Series "220V AC Cooling Fan" blade shape, dip direction, bending direction, the direction of rotation remains the same with the traditional axial fan, there are also air blind, but more expensive.