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At a glance
Be quiet! Silent Wings 4 PRO 140mm Fan is a case fan made by be quiet!. It is listed at one UK shop, which is not showing stock right now.
From the retailer
140mm, PWM, 97.41 CFM (max), 2400RPM (max), 36.8dbA (max), 3.64 mm-H2O (max), Fluid Dynamic Bearing, 4-Pin
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