Air enters the "Mini Air Cooling Fan" base, by the motor drive, and then through the top layer of the base hidden blades blowing up. This layer is horizontally rotating blades, installed after the wind outside the box can not see. After the motor and fan role, has a certain flow of air entering the "Mini Air Cooling Fan" wind box inside the cavity. Attention, inside the wind box is a special cavity structure, rather than a simple metal solid box. A schematic view can be seen from the following cross-section, the cavity "Mini Air Cooling Fan" toward the positive direction of the blower box is thin, completely closed, the opposite direction thick metal sheet wrapped in a circle to leave narrow gap, this gap is the outlet.