This Insignia NS-PCF8050 80mm case fan features a 2000 rpm (±10%) speed that delivers a 23.96 cfm airflow volume to efficiently cool your computer's components. The included 3-to-4-pin adapter offers flexible installation options.
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Using as an external exhaust fan, my only complaint is that is sometimes seems to be a little loud, but it IS mounted on the exterior of my case so that is difficult for me to complain about.