Not to post-crap, but if you chop the blades off a fan, haven't you just removed a huge load on the fan's motor?
I personally can tell the difference between the motor noise and the noise from air turbulence on my 7-volted 120mm Panaflo H1A. The motor noise is usually a lot louder than the turbulence (usually, yes... I don't know why it sounds louder some times than others).
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