"220V AC 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. "220V AC 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 "220V AC Cooling Fan" regulate indoor air, 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.