What is Waterproof Cooling Fan axial fan with runoff?

"Waterproof Cooling Fan" There axial run-of-two, is the direction of the flow of air and fan work is divided. When the axial fan work with axial flow blades push air, so called axial "Waterproof Cooling Fan". Traditional axial fan flaw: the motor due to airflow is blocked, unable to successfully reach the center of the site, resulting in "blind spots." Leads to the existence of blind spots is a core part of the cooling body temperature is high, affecting the overall cooling effect. To solve this problem, runoff "Waterproof Cooling Fan" is produced. When the radial fan is operating, pushing air with the blades perpendicular to the axis direction (i.e., radial) flow, so called run-off the fan.