The biggest question we get about fans would be, Is it silent? Chances are good that all four of these fans would be pretty much undetectable in most peoples systems even when running at full speed. We hooked each of them up in a quiet room to see just how slow they would have to spin before we couldn`t hear them anymore. For our testing we hooked them up to an adjustable fan controller and manually tested their speeds with a digital tachometer while standing approximately 2 feet away from the fan. . ."
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