The Noctua NF-A14x25 G2 PWM is a premium 140 mm PC fan designed for exceptionally quiet operation, both at high airflow and high static pressure. With dimensions of 140 x 140 x 25 mm, this 4-pin PWM fan operates in a speed range of 300 to 1500 RPM, providing nearly silent performance at idle speeds while delivering significant cooling power under load conditions. The fan automatically stops at 0% PWM duty cycle, enabling semi-passive operation. Advanced technical features include a Progressive-Bend rotor with winglets, Centrifugal Turbulator technology, Flow Acceleration Channels, and an AAO (Advanced Acoustic Optimization) housing design. Made from Sterrox liquid crystal polymer with extremely low tolerance, the fan ensures optimal airflow efficiency and minimal noise generation. The high-quality SSO2 bearing system offers exceptional durability with a mean time between failures of over 150,000 hours. Comprehensive safety certifications from UL and TÜV guarantee reliable operation with integrated protection against reverse polarity, overvoltage, and overcurrent, including short circuit protection. The package includes anti-vibration mounts, a 140 mm anti-vibration gasket for improved radiator sealing, mounting screws, a low-noise adapter, an extension cable, and a Y-cable for operating two PWM fans from a single motherboard connector. This successor model from Noctua maintains its reputation for high-quality engineering and reliable performance in demanding computer environments, making it suitable for use as a case fan, on CPU coolers, or with water cooling radiators, where both cooling efficiency and acoustic performance are important considerations.