Noise characteristics

Noise characteristicsThe linear sound power level for this fan is intermediate be­tween an axial and centrifugal if all are selected for best effi­ciency and the same duty. The centrifugal generally has a fall­ing noise spectrum with frequency, whilst the axial peaks in the octave band containing the blade passing frequency. A mixed flow fan has a noise spectra somewhat similar to the centrifugal except that there is a marked reduction in the 63 and 125 Hz bands making silencing more easy.

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