"Waterproof Cooling Fan" to open the wind speed should not be too large, so that the human body has a process of adaptation. Indoor wind speed is best controlled at 0.2-0.5 m / sec, especially in ventilated rooms and in places, fans of the wind speed but can not be too large. "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 regulate indoor air fans, thereby indirectly cooling. When the dripping sweat but can not direct access to fan blowing, so as not to cause surface perspiration disorders, leading to destruction of the human circulation, it is easy to cause a stroke. Summer season, the weather is getting hot, a lot of people but most people choose to summer or "Waterproof Cooling Fan", too covet cool, the fan is placed close to the location away from the body, long kept blowing, some people due to excessive, improper use electric fans, resulting in a cold, fever and other symptoms, you should do the proper use of electric fans, the following describes the proper use of the small series fans should pay attention to.