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    Acoustical Noise Level

    Acoustical sound measurement of HXHT fans is made in anechoic room with background noise less than 15 dBA. The measured fan is running in free air with a microphone at a distance of one meter from the fan intake.

    Sound Pressure Level (SPL), which is environmentally dependent, and Sound Power Level (SPL) are defined as following :

SPL = 20logP/Pref

andSWL = 10logW/ Wref

P = Pressure

Pref = A reference pressure

W = Acoustic power of the source

Wref = An acoustic reference power

Fan noise data is usually plotted as SPL against the octave frequency bands. The following provides an indication of the effect of dBA changes:

3 dBA Barely Noticeable

5 dBA Noticeable

10 dBA Twice as loud

Noise levels :

0 ~ 20 dBA Very Faint

20 ~ 40 dBA Faint

40 ~ 60 dBA Moderate

60 ~ 80 dBA Loud

80 ~ 100 dBA Very Loud

100 ~ 140 dBA Deafening

 

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