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Would adding a gap between the fan and the rad make less noise?

post #1 of 4
Thread Starter 
Like maybe 10-12mm using old fans cut in half and just using the frame, I have seen it for airflow but never for noise reduction, I assume it would, anyone know before I cut these old 120x120x25 fans up?
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post #2 of 4
I've seen people do this to make a kind of wind tunnel. I think it would help reduce noise. Maybe find some duck tap to seal the gaps. It should actually increase performance, especially if you do this with push pull on the rad.
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post #3 of 4
Thread Starter 
I dont know about sealing the holes, maybe for performance but I think noise wise the holes might help, my old fans are 5x cooler master Excalibur and 2x of the stock h100 corsair fans.




I noticed it when I took the first fan out of my case to replace them and put it full it was 10000x quieter then if I had one full on the rad, then I put it on my desk then pulled it away slightly and it was sooo much quieter.
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post #4 of 4
There are a number of factors that come into play, but a fan on a radiator, will always be louder than a fan in free air.

Adding a shroud to increase the space between the radiator and the fan may reduce noise, because it evens out the air flow through the radiator, reducing localized spots of higher static pressure and air velocity that cause uneven loading of the blades, but it will still be significantly louder than in free air.

As for "sealing the holes", any air that passes through gaps between the fan and radiator is doing nothing for cooling.
For best cooling performance you want all of the air passing through the radiator.
Edited by Caleal - 1/29/12 at 3:31pm
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