Noctua NF A4x10 PWM. Type: Fan, Fan diameter: 4 cm, Rotational speed (min): 1000 RPM, Rotational speed (max): 5000 RPM, Airflow: 8.9 m³/h, Maximum air pressure: 1.95 mmH2O, Bearing type: Self-Stabilising Oil-pressure Bearing (SSO). Voltage: 12 V. Product colour: Beige, Red