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 Size 40x40x10 mm Screw hole spacings 32 mm Connector 3-pin Bearing SSO2 Blade Geometry A-Series with Flow Acceleration Channels Frame Technology AAO (Advanced Acoustic Optimisation) Rotational Speed (+/- 10%) 4500 RPM Rotational Speed with L.N.A. (+/- 10%) 3700 RPM Airflow 4.8 CFM Airflow with L.N.A. 3.9 CFM Acoustical Noise 17.9 dB(A) Acoustical Noise with L.N.A. 12.9 dB(A) Static Pressure 1.78 mm H2O Static Pressure with L.N.A. 1.21 mm H2O Max. Input Power 0.6 W Max. Input Current 0.05 A Voltage 12 V MTBF > 150,000 h Accessories Low-Noise Adaptor (L.N.A.), 3:2 Pin Adaptor, OmniJoin Adaptor Set, 30cm Extension Cable, 3 Vibration-Compensators and 4 Fan Screws Warranty 72 months