noise reduction for server

I just got a server. The noise produced by the server is kind of ignoring. I believe the noise is coming from the blower cooling fan. I have looked up the information of the cooling fan and found out the noise level is about 47 db. Is that a normal noise level? Is there anyway to reduce the noise level?
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the sound is unavoidable if it is from SMPS FAN
if the fan is on board which makes sound then replace it as it it is not normal........
see to that the fan rotate with free motion...............

jeff1919Author Commented:
It's not smps fan. It's the fan on board. I have thought to replace it. i believe i need to get the fan with the specification about the same as the current one except lower noise produced.  But I don't know where do i get one. I have searched the internet. If found some fans similar to my current one, they all generate about the same noise level (47 db(A) ).

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