"Cooling Fan" unique "2-step dust" depicts, the first step after a fine dust network, before the air enters the cold wind circulation fan system, the blocking dust into the outlet into the interior of the fan, to avoid air pollution with dust inside the fan, to avoid air duct clogging, making the process of blowing insisted intelligible, allowing easier cleaning; the second step, the cold wet curtain fan set filters in the process of integration of wind and water, filtered increasingly fine dust, bacteria multiply completely damaged hotbed for the user's well-being to a good final hurdle. There are two layers of dust and dust pollution will be depicted in the well-being obstructed alert line, summer, cool, well worry!