For "220V Cooling Fan" and environmental changes, with better heat conduction - the original pure fan of the wind structure in the block; the need to reverse the entire structure. This introduced a contrast with the ordinary fan fan is out of the wind structure: drained "220V Cooling Fan"! This series of fan motors Unlike axial fans mounted on the inlet side of the spindle support is correspondingly moved to this side, clearing the way to send the airflow. Fan blade shape, dip direction, bending direction, the direction of rotation is still the traditional "220V Cooling Fan" the same, there are also air blind, but more expensive. Personal recommendation: the most suitable CPU cooling application! Integrated air flow pressure is high!