Summary These fans have been specifically developed to deliver significant airflow while maintaining low noise levels. Silent Series R2 fans are available in sizes from 40mm up to 140mm. All new Silent Series R2 fans are equipped with high performance hydraulic bearings, increasing both fan performance & reliability. The 120mm & 140mm fans come with a low-speed adapter, which lets you choose between two different rotation speeds without a separate fan controller. Each fan 60mm & larger is packaged with both 4 metal screws & 4 rubber screws to ensure maximum fan-mounting options. Using the rubber screws allows mechanical decoupling from the case itself, reducing vibrations & decreasing the noise level (40 & 50mm feature metal mounting screws only). The cable on each Silent Series R2 fan is fully sleeved for effortless cable routing & enhanced aesthetics. Product Features Dimensions: 80 x 80 x 25mm RPM: 1400 +/- 10% RPM Noise: 11 d BA Airflow: 16 CFM, 27 m&sup 3;/h Connection: 3-pin Power: 0.48 W +/- 15% 4pcs metal screws included 4pcs rubber screws included Textile covered electrical cable