Noctua G2 PWM Dual Fan Set with and Parallel Usage NF-A14x25 Sx2-PP, Push-Pull (Brown)

We offer a wide variety of products, and the following precautions apply to some of them. Please note that they are listed for all products. 【Voltage Compatibility】Designed for Japanese voltage (90-110V). Using with a different voltage may cause malfunction. 【Plug Type】Japanese plugs (A or B type). Use a conversion adapter if needed. 【Transformers & Adapters】Transformers adjust voltage; adapters only change plug shape. Using an adapter without a transformer may damage the product. 【Liability】We are not responsible for damages caused by improper use, such as using the product without a transformer. Dedicated dual fan set with two NF-A14x25 G2 PWM 140x25mm fans with slightly offset speeds (±25rpm) to avoid unwanted acoustic interaction phenomena State-of-the-art engineering (progressive bend impeller with winglets, centrifugal turbulators, flow acceleration channels, and AAO frame) and construction (Sterrox LCP, ultra-close tip clearance) Ideal for push-pull applications or situations where two fans are running in parallel (e.g. 280 mm water cooling radiator, case intake fan, exhaust fan, etc.) Includes anti-vibration mount, 14cm anti-vibration gasket to strengthen sealing of radiators, etc., fan screws, low noise adapter (LNA), extension cable, and Y cable to run two PWM fans on the same header. Reliable Noctua quality with premium level SSO2 bearings (MTTF＞150,000 hours), UL and TÜV safety certifications, protected against reverse polarity, overvoltage and overcurrent (short circuit) NF-A14x25 G2 PWM Sx2-PP is a set of two NF-A14x25 G2 PWM square frame 140mm fans with offset rotation speed. This is beneficial in push-pull operations as well as in situations where two fans operate side by side, such as in case cooling applications and 280mm water cooling radiators. When two fans operate at approximately the same constant speed in a push-pull configuration, or to a lesser extent side-by-side, their acoustic interaction can lead to undesirable harmonic phenomena such as intermittent vibrations and periodic humming due to interference. Therefore, the two NF-A14x25 G2 PWM fans included in the Sx2-PP set have slightly offset speeds (±25rpm) to avoid this phenomenon. This fine-tuning is made possible by the fan's new etaPERF motor and NE-FD6 driver IC for extremely precise speed control, and thanks to its SupraTorque feature, it leverages torque headroom to deliver precise desired rotations, even in the presence of large flow resistances such as water-cooled radiators or heat sinks. You can maintain your turnover. By running one fan ~25 rpm slower (PPA) and the other ~25 rpm faster (PPB), you can effectively prevent intermittent vibrations and periodic hum while maintaining overall cooling performance. Since the perception of beat frequency varies depending on psychoacoustic preference, users can easily create a quieter environment by slowing down the PPA fan a bit more with PWM control or the included low-noise adapter.