Half of the noise generated by a fan/rad combi is from the friction of air passing over the fins. You increase the FPI, the noise level increases also. As either FPI or Core Depth increase, a fan with higher pressure is required to penetrate. Most 120mm fans with higher pressure mean higher noise output due to higher CFM. Higher CFM means more air blown over fins means more frictional noise.
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air restriction does not slow down fan that much, instead the air bounces back through the fan
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Waste of good air... if it's going anywhere other than thru the rad, it's inefficient.
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Maybe I should move to Europe.
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I'll go make up the bed in the spare room...
