, although sleeve bearing.

*shudders*

Like I said......
Just pop the button, give 'em a squirt, and they are good to go again for a looooooooooong time. Once a ball bearing fan acts up, they don't always respond so well to an oil massage.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

If you have room to fit it you might want to consider the SANYO DENKI - SANACE FANS - 9CR1212P0G03 - FAN, C/ROTATING, 120X120X76MM, 12V.
Flow Rate - Imperial: 300cu.ft/min
Flow Rate - Metric: 8.5m³/min

It is a bit noisy.

Been at this for a number of years and have found the fans from Corsair to be fairly quiet moving a good amount of air. Throughout my many configurations I have used their LCS products to great satisfaction. My home office sits on the side of the house that gets all of the sun and no breeze and in the summer room temps can get in the low to mid 30c. I recently upgraded the fans for the LCS on my main machine. They also make excellent case fans. You may be able to find them locally.

http://www.corsair.com/us/cpu-cooling-kits/air-series-fans.html

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I don't buy computers, I build them!!

, although sleeve bearing.

*shudders*

Like I said......
Just pop the button, give 'em a squirt, and they are good to go again for a looooooooooong time. Once a ball bearing fan acts up, they don't always respond so well to an oil massage.

Completely agree. Sleeve bearing can be fixed very easily with a (small) drop of oil. Fixed several fans like that already, some of them run after that longer than before their first failure.

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Completely off topic, I'm wondering if anybody has ever thought to recoup some of the energy by placeing a (very small) windturbine behind the exhaust?

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A person who won't read has no advantage over one who can't read. (Mark Twain)

My standard high flow fan for a few years now has been the Scythe UltraKaze.

120 x 38MM, 3000rpm, 133cfm, 46db.
Lotsa air, not as noisy as some.

I have one left as a spare NIB. And Newegg or Tiger don't seem to sell them anymore. May have to find another source, if they are still made.

They are great fans, although sleeve bearing.
They run OK for a year or two 24/7, and when they start to squeal, I just have to pop off the little rubber button over the bearing cup, give them a little squirt of HVAC oil, and they are good to go for another year or two...

I'm using mostly Deltas here, 4 @ 3400rpm @ 46db @ 113cfm(120x25mm), 1 @ 3200rpm @ 130cfm(120x38mm), and 1 @ 3900rpm @ 148cfm(120x38rpm) and 2 Koolance @ 2600rpm @ 108cfm(120x25mm), the Delta's have open corners, the Koolance fans do not, otherwise I'd probably use more Koolance fans.

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The T1 Trust, PRR T1 Class 4-4-4-4 #5550, 1 of America's First HST's

Completely off topic, I'm wondering if anybody has ever thought to recoup some of the energy by placeing a (very small) windturbine behind the exhaust?

Hook up a small LED to the turbine. Then the brightness of the LED will give you a direct readout of how hard your GPUs are crunching.

Better yet, one of those multi-LED (green to red) arrays commonly used as sound level meters in mixing desks...