Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua's AAO frame, the NF-A4x10 FLX is a highly optimised, premium quality quiet fan in 40x10mm size. Smooth Commutation Drive technology and Noctua's reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, a Low-Noise Adaptor and OmniJoin Adaptor Set as well as six years manufacturer's warranty, the NF-A4x10 is a premium choice for the highest demands. Specifications Size40x40x10 mm Screw hole spacings32 mm Connector3-pin BearingSSO2 Blade GeometryA-Series with Flow Acceleration Channels Frame TechnologyAAO (Advanced Acoustic Optimisation) Rotational Speed (+/- 10%)4500 RPM Rotational Speed with L.N.A. (+/- 10%)3700 RPM Airflow4.8 CFM Airflow with L.N.A.3.9 CFM Acoustical Noise17.9 dB(A) Acoustical Noise with L.N.A.12.9 dB(A) Static Pressure1.78 mm H2O Static Pressure with L.N.A.1.21 mm H2O Max. Input Power0.6 W Max. Input Current0.05 A Voltage12 V MTBF 150,000 h AccessoriesLow-Noise Adaptor (L.N.A.), 3:2 Pin Adaptor, OmniJoin Adaptor Set, 30cm Extension Cable, 3 Vibration-Compensators and 4 Fan Screws Warranty72 months.