A Question Of CFM...

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Werzbowski

Werzbowski

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Sep 30, 2013
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if a 200mm fan puts out x amount of cfm, would two 140mm mounted in the same location with a higher combined cfm rating actually be moving more air?
 
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makkem
HI
Firstly two 140 fans with a combined air volume more than a single 200 would indeed move more air,however the 140 fans would be revolving faster to achieve this and so would make more noise.
Secondly two 140 fans do not make one 280 fan but in fact make slightly less than one 200 fan(30787 mm squared as opposed to 31416 mm squared)
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ddbtkd456

ddbtkd456

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Sep 4, 2013
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Yes and no. Yes because the 2 x 140 mm fans aren't focusing all in the same spot as the 200 mm, however the reverse is true as well, the 200 mm focuses stronger air pressure in one spot then the 2x 140, however i would go with the 2 x 140 since together they technically make a 280 mm fan. lol Also please remember to select your best answer so that others may learn from your thread. Remember that you can contact me anytime about any questions or concerns you might have about things in the future. Thank you for your time and have a pleasant day/night.
 
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makkem

makkem

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Jan 22, 2012
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HI
Firstly two 140 fans with a combined air volume more than a single 200 would indeed move more air,however the 140 fans would be revolving faster to achieve this and so would make more noise.
Secondly two 140 fans do not make one 280 fan but in fact make slightly less than one 200 fan(30787 mm squared as opposed to 31416 mm squared)
 
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ddbtkd456

ddbtkd456

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ummm.....i was talking radiators fans....but okay if you want to come out swinging, then yes you are right about the noise level, however you are wrong, because 140+140=280 mm worth of fans....radiator terms....which is the way fans are measured.
 
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makkem

makkem

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Yeah ,sorry I did not mean you to take it as a criticism and you are correct in the case of a radiator but there was no mention of radiators in the original post and the volume of air through a fan is proportional to the fan speed and the cross sectional area and if the 140 fans and the 200 fan were running at the same speed then the 200 fan would move more air.
 
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ddbtkd456

ddbtkd456

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Absolutely correct. Nice to see someone else knows about air flow and cooling other then me on this forum.
 
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