biggest available PC fan

Hi,

1st, I search the biggest available 12 V PC fan.
(If you know a fan (normally usage not for PCs) which is big and run with 12 V, it's also OK. ;-)

Not the biggest housing, the biggest radius of the rotor blades respectively diameter of the opening.

2nd, the best ratio: power consumption / performance (air flow rate).

Maybe you can help me?

Thanks.


* Best regards! :-) * Sutaru Tsureku, team seti.international founder. * Optimize your PC for higher RAC. * SETI@home needs your help. *
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>Das Deutsche Cafe. The German Cafe.<

I'm not sure specifically what you are after. You mention fan with the biggest possible diameter? That does not necessarily have anything to do with having the most airflow....

A large fan with low RPMs can quite possibly move LESS air than a smaller very high RPM fan... (The difference is typically noise, larger diameter fans produce less noise per air moved.)

If you are looking for maximum airflow, you need to look for fans with high CFM (Cubic feet per minute).

Here is a newegg.com search I did, only fans with the highest CFM are listed, highest price first.

(You will notice, the 120mm (and even 92mm) fans at the top of the list, push much more air than the 180mm/250mm fans under it...)
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-Dave #2


3.2.0-33

$14 at Lowes, drops temps 15C.
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Executive Director GPU Users Group Inc. -
brad@gpuug.org

...But those are gonna draw some juice!

...But those are gonna draw some juice!

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

@Slavac: LOL! :-D

...But those are gonna draw some juice!

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

@Slavac: LOL! :-D

It's ugly as heck, garish even, but good lord it's effective.

Have a look at automotive fans, they shift some air, most are 12V (avoid trucks and RVs which are often 24V). But they do draw some current, don't be surprised at tens of amps if you got up to 500mm or more!
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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

I bought some Multicomp, MC21710, 120mm, 12V, 1.6A, 190CFM (approx 5.5M^3) fans a while back.

Running on 12V they sounded like a fire siren, but feeding them from 5V they are much quieter and still push enough air to cool 3 x GTX470's in summer.

I have also used Slavac's method with good results too.

T.A.

I guess how you want to use the fan really comes down to what you really want. I have some 120vac 120mm fans that probably move several hundred CFM, but they make about as much noise as a 474 taking off from the runway. I was using them to cool my Celeron 333MHz with a sandwich cooler to get it up to 666MHz.
Later I got a commercial 30" air circulator. Which I placed on the floor by my desk and had it blow into/through the case. Made less noise and was as effective.

If you have a limit on the amount of noise you are willing to tolerate then you can find the highest volume fan that makes that much or less noise.

A squirrel cage/centrifugal fan might also be something you want to look at.
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As a retired electronics engineer I cannot recommend running fans below their nominal voltage. Expecting a fan to start at half voltage a few years down the road is only asking for trouble.

If you want a DC fan to run slower use a PWM controller. A PWM controller runs the fan on pulses of 12V, the width of the pulses being proporional to the required speed.