"Cross Flow Fan" stream from the base up, spread the wind box full of cavities, to a certain extent it will accumulate more than the normal atmospheric pressure outside the body cavity, thereby forming the wind. Generous rear end and the front end of the narrow chamber experience forced internal air flow towards the rear end of a broader movement cavities, continues to "squeeze each other" only from the air last tiny slit "leak" out, after a period of continuous operation, this structure can gradually strengthen air pressure, air gap resorted to air more quickly.