more fans or more cfm

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vveeger
Posts: 5
Joined: Sun Dec 08, 2013 9:27 am

more fans or more cfm

Post by vveeger » Fri Dec 20, 2013 4:18 am

might be a stupid question, but I'm not sure.

fan1: M12-1, 8dBA, 58cfm3
fan2: M12-2, 16dBA, 87cfm3

can I argue 2x fan1 is same noise as 1x fan2, 2x fan1 is always better compared to 1x fan2 because it delivers (2x58-87) = 29cfm3 more airflow?

Pappnaas
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Location: Germany

Re: more fans or more cfm

Post by Pappnaas » Fri Dec 20, 2013 8:16 am

What is a decibel? Zero decibels (0 dB) is the quietest sound audible to a healthy human ear. From there, every increase of 3 dB represents a doubling of sound intensity, or acoustic power.
http://www.noisehelp.com/decibel-scale.html

So, no, you can't.

CA_Steve
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Re: more fans or more cfm

Post by CA_Steve » Fri Dec 20, 2013 8:43 am

Short answer: 2 fans means you would get more cfm with less noise than the one louder fan. You might find this handy.

NeilBlanchard
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Re: more fans or more cfm

Post by NeilBlanchard » Fri Dec 20, 2013 9:33 am

The best method is to reduce air restrictions by cutting out stamped grills, etc. Then a slower fan has better airflow, and is much quieter.

vveeger
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Joined: Sun Dec 08, 2013 9:27 am

Re: more fans or more cfm

Post by vveeger » Fri Dec 20, 2013 1:17 pm

CA_Steve wrote:Short answer: 2 fans means you would get more cfm with less noise than the one louder fan. You might find this handy.
great info CA-Steve, thanks a lot!

CA_Steve
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Re: more fans or more cfm

Post by CA_Steve » Fri Dec 20, 2013 2:33 pm

The longer answer is: It depends on the case and the components therein. :)

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