【 Dc fan 】 Not in addition to the noise, uncomfortable.
in addition to the heat dissipation effect, the cooling fan noise is also a widely concerned problem. The size of the fan noise is generated when the fan noise, affected by various factors, the unit is decibels ( dB) 。 Measure the cooling fan noise to the sound attenuation of noise is less than 17 db chamber, fan, one meter distance along the direction of the cooling fan shaft alignment fan inlet, measured using A weighted way. Spectrum characteristics of cooling fan noise is also very important, so you also need to use spectrometer to record the noise of the fan frequency distribution, generally requires little as far as possible, the noise of the fan and cannot exist different sounds.
the relevant recommendation: automobile cooling fans, http:///products- 细节。 asp吗? cpid = 103