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  1. #1
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    Default Case fan question

    Hellllooooooooo......... again. I have been looking around for a good fan, most i find are pretty bad.. What I want is 120+ CFM fan that is under 25 DB. Thanks.

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    Default Re: Case fan question

    You are probably talking 200mm fan specs there. What size are you thinking of?
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    Default Re: Case fan question

    Your not going to find a low noise 120mm fan with a high cfm, the best you can do is a 120mm fan from Cougar that around 90cfm with a 17dBa
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    Default Re: Case fan question

    Jeez, they must have been yards away to measure a 90cfm fan at 17dBa.

    As a general rule you should treat manufacturers dBa claims with a pinch of salt because they do not generally mention distance, plane or frequency at which they measured. To get a true picture of noise you need a waterfall diagram and details about distance and whether on axis or not, in free air or not. anechoic or not.

    You will notice that most claims are "a weighted". This is the best way to hide any aberrant sounds by centering on the best frequency to suit the claim

    Noise from fans is the most difficult thing to accurately convey to the buying public because it is not only quantitative but qualitative too

    as for 17dBa.....or even 25dBa at 120+ cfm.... Take a look at these

    Google Image Result for http://www.xbitlabs.com/images/coolers/120-140-fans-roundup/13_diagr_33dba.png

    http://www.dot.ca.gov/dist2/projects/sixer/loud.pdf

    http://www.captiveaire.com/CATALOGCO...ON%20CHART.pdf

    Table chart sound pressure levels SPL level normal sound pressure and sound intensity ratio sound units calculation comparison loudness decibel dB scale ratio factor unit examples - sengpielaudio Sengpiel Berlin

    The last link (from German) is VERY informative on the subject.

    so what you are talking about is somewhere between listening to someone breath from 10 feet away and a person breathing heard from 3 feet away

    Having said all that.... we know what you are looking for... The Holy Grail of fans. The bad news is that a true 120cfm fan (especially a 120mm one) is just not going to be quiet.
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  5. #5
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    Default Re: Case fan question

    Well I guess your right... Lol 120 CFM...... Ill check some other fans and the ones you listed

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