This product is either discontinued or we cannot get that from suppliers.
Noctua NF-A4x10-PWM 5000RPM 40mm Case, Fan Size 40x40x10mm, 4-Pin PWM Connection, SSO2 Bearing, AAO Frame, Integrated Anti-Vibration Pads, Inner Surface Microstructures, Rotational Speed 5,000 RPM, 3,700 RPM with L.N.A, Min Rotation Speed 1,000 RPM, Airflow 8,9 m³/h, 6,6 m³/h with L.N.A, Acoustic Noise 19,6 dB(A), 12,9 dB(A) with L.N.A, MTTF >150,000 Hours, Operating Voltage 12V.
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x10 is an award-winning, premium-quality quiet fan in size 40x10mm.