"24V DC Cooling Fan" major components making noise is the motor in the selection of fans must listen whether the noise when the motor is running, to see it in operation whether is stable; good motor let you in quiet environment, only to hear the wind, "whispers", ultra-quiet fan blowing air is good. When fans use the best placed next to windows, doors, facilitate air circulation, improve the cooling effect, reducing power consumption. Note fan routine maintenance. To maintain its good performance, avoid blade deformation, vibration occurs, which to some extent, in favor of energy saving. Choose excellent quality products. Since the fan industry and technology low, uneven product on the market, be sure to choose well-known brand products, so to ensure quality.