After the arrival of summer, we often blow on the fan, put the fan in a position very close to the body, blow non-stop for a long time, so that eventually lead to the loss of balance of the blood circulation of the human body sweat excretion is not balanced, may occur headaches, dizziness, general discomfort and other symptoms, serious can also induce stroke. So how to use and place the famous electric fan brand correctly? 1. The wind speed of the electric fan should not be too large, and the indoor wind speed is best controlled at 0.2-0.5 m/s, especially in the room with good ventilation and in the place with drafts, the wind speed of the fan should not be too large. 2. The electric fan should not be blowing directly at people, and the wind evil is easy to invade the body, especially when the body is weak or sweaty, it is best to let the fan blow towards a corner. Children, the elderly, the weak, it is more appropriate to use less fan to blow, but the electric fan can adjust the indoor air flow, so as to indirectly cool down. When sweating, you can not directly approach the fan to blow, so as not to cause body surface sweating disorders, leading to the destruction of human circulation, which is easy to cause stroke.