About server level fans

[johnyj]

I'm looking for some 120MM server level fans that have 130+ CFM but still relatively quiet, but most of them are very noisy

I read on this forum that there is a Delta AFB1212VHE model which claims to be the best 120MM fan in noise/CFM ratio, but this fan is not a PWM model, I just purchased some AFC1212DE model with 193 CFM, but the noise is almost as lound as a vacuum cleaner

So it seems that a 120MM fan can only generate around 100CFM without being too noisy, anyone compared delta fan with gentle typhoon AP31 ?

[EngMan]

I think the problem once you get into the higher flow rates that the fan design can't help with is the amazing amount of air that is "wooshing"....moving very quickly, through the system. It is less a fan problem with many of the fans and more of the nature of the volume of air. Even top-notch bearings and a great blade design are hard to make these quiet at the higher air flows.

 Do you have room to put more fans which you can run at a lower speed, instead of a few very high speed and flow fans? Could you duct/reposition/etc your setup so you don't need as much air, as long as it is used more efficiently?

[johnyj]

I think the problem once you get into the higher flow rates that the fan design can't help with is the amazing amount of air that is "wooshing"....moving very quickly, through the system. It is less a fan problem with many of the fans and more of the nature of the volume of air. Even top-notch bearings and a great blade design are hard to make these quiet at the higher air flows.

 Do you have room to put more fans which you can run at a lower speed, instead of a few very high speed and flow fans? Could you duct/reposition/etc your setup so you don't need as much air, as long as it is used more efficiently?

You are right, maybe that is the wrong approach, so far I'm impressed with Gentle Typhoon AP15, very quiet but still great amount of air flow, just bought several more and will stick to those for a while

[BlazinBeaches]

All delta fans are loud.  You could always get a fan controller to manually control the ones that aren't PWM.  FrozenCPU might have a couple PWM ones on there.

Gentle Typhoons have weak static pressure and are basically useless in mining rigs.  Most regular computer fans are useless in mining rigs.

The one great fan is the Silverstone Air Penetrator.  The 182 version of the 180mm fan spins at 2000rpm and pumps out 170cfm of directed air with great static pressure.  Other than these fans and maybe a few others, regular fans you buy at the store are much better than most computer fans.  And a lot cheaper as well.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835220048

[HellDiverUK]

Gentle Typhoons have weak static pressure and are basically useless in mining rigs.  

Uhh...no they're not.

[FullLife]

I think the problem once you get into the higher flow rates that the fan design can't help with is the amazing amount of air that is "wooshing"....moving very quickly, through the system. It is less a fan problem with many of the fans and more of the nature of the volume of air. Even top-notch bearings and a great blade design are hard to make these quiet at the higher air flows.

 Do you have room to put more fans which you can run at a lower speed, instead of a few very high speed and flow fans? Could you duct/reposition/etc your setup so you don't need as much air, as long as it is used more efficiently?

You are right, maybe that is the wrong approach, so far I'm impressed with Gentle Typhoon AP15, very quiet but still great amount of air flow, just bought several more and will stick to those for a while

Definitely not true.  I've used these as well as AP-45s, both work well.