"Waterproof Cooling Fan" who should not be facing the wind, blowing straight, invade the body, especially in frail or sweating, it is best to let a fan blow in one corner. Children, elderly, frail people, but should use less fan blowing, but can be "Waterproof Cooling Fan" regulate indoor air, thereby indirectly cooling. Sweat more when not directly approaching dripping "Waterproof Cooling Fan" blow, in order to avoid surface perspiration disorders, leading to destruction of the human circulation, it is easy to cause a stroke. When the wind should not open too much sleep, during sleep, the body slows down circulation of people, but this time the body is most vulnerable when facing the body of excessive wind blowing, it will cause the body extremely suited appeared human weakness symptoms appear severe stroke.