Zalman Ultra Quiet 80mm FDB Case Fan with Shark Fin Blade Design Cooling, Black ZM-F1 FDB (SF) Fluid Dynamic Bearing (FDB) structure generates high pressure oil layer on micro Channel's intersecting point, which prevents friction between the fan's shaft and bearing, thus resulting in maximum fan life span (150,000 hrs) with minimum noise. Shark fin blade design optimized for maximum airflow, Shark's Fin blade greatly reduces the turbulence caused by the fan rotation decreasing the noise and vibration. Minimized noise and vibration through lowest ripm. Silicone pin absorbs the vibration between the fan and the case allowing a quiet work environment. Dimension: 80(L) x 80(W) x 25(H)mm / Weight: 80g / Fan Speed: 2,000 rpm / Noise Level: 20-23dBA / Voltage: 12V / Life Span; 150,000 hrs