Cavity "220V Cooling Fan" box toward the positive direction of the thin air, completely closed in the opposite direction thick metal sheet wrapped after leaving a narrow slit in a circle, this gap is the outlet air flow from the base up, spread the wind box filled cavity, accumulated to a certain extent, will exceed normal atmospheric pressure outside the body cavity, so the formation of the wind. The "220V Cooling Fan" generous rear end of the front end of the narrow chamber experience forced airflow inside the cavity toward the rear end of a broader movement, constantly pressed against each other in the air last only go from tiny slit in continuous operation for some time, This structure can gradually strengthen air pressure, resorted to air outlet slit of gas flow in the direction of the wind box chamber once the outlet flow rate, the formation of hair effect, will cause the surrounding "220V Cooling Fan" wind box Follow the air flow. On the one hand, the air from the back of the fan will be added after coming forward, to strengthen the central air effect,