![]() There offer some simple methods of reducing noise from fan.Īn excellent way to stop the vibration and noise made by the fan is to use acoustic boxes. Motor mounting noise is difficult to define. This can be caused by the components and mechanism within the fan, such as residual unbalance, bearings, rotor to stator eccentricity and motor mounting. However, fan are generally quieter when operated near their peak efficiency. This variation is unpredictable and fan dependent. For instance, if the speed of a fan is reduced by 20%, the dB level will be reduced by 5 dB. Speed is a major contributor to fan noise. Inlet and Outlet disturbances, sharp edges and bends will cause increased turbulence and noise. Turbulence is created in the airflow stream itself. ![]() It can be controlled somewhat by good blade profile design, proper pitch angle and notched or serrated trailing blade edges. This is a broad band noise source generated by air separation from the blade surface and trailing edge. Noise emanating from ventilation fan is a function of many variables and causes, for example: Long exposure at 85 dB is dangerous at 120 dB, even short exposure can do damage. ![]() Loudness of sound is commonly expressed in decibel (dB), the more intense the sound, the higher the db count. The higher the frequency, the more high-pitched a sound is perceived. There are two important characteristics of sound or noise - frequency and loudness. Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing.
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