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Originally Posted by Salkcin
How do I find this data? isn't this specification only public with industry targeted fans like Delta, Papst and Panaflo?
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For those 3 the data is on their site (in the PDF specs). They make excellent fans IMHO so no need to look further. The problem is, how much backpressure a given rad/shroud combo creates ? It's being solved here in these forums...
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Originally Posted by Salkcin
The fan is Enermax UC-9FAB.
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It's an average fan: produces average flow, average noise, at least according to data i've seen until now. There are certainly 120mm fans that produce the same flow for less noise, or more flow for the same noise. Think car engine: there's no replacement for displacement :P
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Originally Posted by Salkcin
120mm @ 2100RPM is definately not quiet in my ears.
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Did you try this particular fan ? The blades shape incur different noises, each mfger choose different approaches. The tip vortex is responsible for most of the noise in some cases, and in other cases it's the engine itself. Try this Delta fan, i've got an ADDA reference as well that's very good (the ones sold with Lian Li V-Series cases)
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Originally Posted by Salkcin
A Papst 120mm running 1600RPM (55CFM) is driving me insane.
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Which model is it. The Papst 4412 N/2GL i have is one of the most silent i know at 12V. It doesnt support undervolting though, the engine starts to hum.
For the next point Marci answered it very well. It's a problem of engine torque, not air backpressure. There are *real* variofans made by Papst but unfortunately they're not the most quiet.
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Originally Posted by Salkcin
Any idea of how big? 92 x 40% = ~36,8mm from the radiator core?
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I believe someone published a rule of thumb here on these forums at one point, i can't remember the exact figure though. IIRC it's closer to 33% (1/3) but what i recall as well is it's better to have too large a shroud than too narrow.