That might be the maximum they're rated to tolerate, but they almost certainly don't pull that during any normal use (taking normal as sub 10,000RPM usage).
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About half the Delta line uses 30W or more at all times. There is a 78W fan that is readily available.
Server world is VERY different from the desktop world.
http://www.sidewindercomputers.com/delhigper.html
chart at the bottom with wattage and airflow for the different models. notice the bottom model - 2.65A, 31.80W, 220.29CFM, 59dB @3400RPM :D
It might well be that "rated input power" means the most you can put in before it burns, not the amount it usually draws. It would be possible to do some maths and work out whether (220.3CFM of air) + (59dB from an object with the aproximate weight of a fan) = 31W.
Until someone can be bothered to do so (I can't), I apologetically accept that I was wrong and that fans can in fact draw this much :P
I can pull out my Amp meter later and check it out.
Oh i forgot to add.... these are 110v steel fans, not 12v plastic ones.
salvaged from a industrial machine
http://www.cps.fi/Eng/tuul_iso120.htm
3rd from the bottom, looks the same but mines 110v not 230v
rated at 330cfm and i've got two of them bad boys hahahhahahhahahhahhaha
I do think your right about the peak consumption though. and typically my fans run at 50% speed anyways
There are some absurd computer fans on frozencpu.com.
The problem is that you will have to bolt your computer to the floor.
That's a lot of fan.
It would seem this discussion has gotten out of hand :P