When measuring "Inflatable Air Blower" noise requires less than 17dB noise silencer chamber conducted, one meter away from the fan, and the fan shaft is aligned along the direction of the fan air intake port, the use of A-weighted measurements manner. The spectral characteristics of the cooling fan noise is also very important, so we must also use a spectrum analyzer records "Inflatable Air Blower" noise frequency distribution, the general requirements of the fan noise to be as small as possible, but can not exist different tone. Fan noise and friction, air flow related. Fan speed, the greater the amount of wind noise will be greater due to the other "Inflatable Air Blower" their shock factor can not be ignored. Of course, high-quality fans will shake itself is small, but the first two were, but it is difficult to overcome.