Noctua NF-A14x25r-G2-PWM-Sx2-PP

Noctua NF-A14x25r G2 PWM

The NF-A14x25r G2 PWM Sx2-PP is a set of two NF-A14x25r G2 PWM round-frame 140mm fans for push-pull operation on heatsinks such as the NH-D15(S) or NH-U14S. When two fans operate in a push-pull configuration running at almost the same, constant speed, their acoustic interaction can lead to undesirable harmonic phenomena such as intermittent vibrations or periodic humming due to interference, which can be heard as beat frequencies. Therefore, the two NF-A14x25r G2 PWM fans contained in the Sx2-PP set are slightly offset in speed (+/- ~25rpm) in order to avoid such phenomena. This fine-tuning is made possible by the fans’ novel etaPERF motor and its NE-FD6 driver IC that achieves extremely precise speed control and, thanks to its SupraTorque feature, can leverages extra torque headroom to keep the exact desired speed even when working against significant flow resistance such as on heatsinks.

FAN Specification
Size 140x140x25 mm
Mounting hole spacing 105x105 mm
Connector & pin-configuration 4-pin PWM
Cable length 20cm + 30cm NA-EC1 extension cable
Bearing SSO2
Blade geometry Progressive-Bend impeller
Frame technology AAO (Advanced Acoustic Optimisation)
Material Sterrox LCP
Rotational speed (+/- 10%) 1500 RPM
Rotational speed with L. N. A. (+/- 10%) 1250 RPM
Airflow 155,6 m³/h
Airflow with L. N. A. 127,1 m³/h
Acoustical noise 24,8 dB(A)
Acoustical noise with L. N. A. 19,7 dB(A)
Static pressure 2,56 mm H₂O
Static pressure with L. N. A. 1,3 mm H₂O
Input power (max. ) 2,28 W
Max. input current 0,19 A
Operating voltage 12 V
Voltage PWM signal 5 V
MTTF > 150.000 h