The nf-a20 is a highly optimised. Premium quality quiet 200mm fan. Featuring an aao advanced acoustic optimisation standard frame as well as sophisticated aerodynamic design measures such as flow acceleration channels. The nf-a20 brings the renowned quiet cooling performance of noctua’s award-winning a-series to the increasingly popular 20cm form factor. The pwm version uses noctua’s custom designed ne-fd1 ic for fully automatic speed control via 4-pin fan headers. Which allows it to strike a perfect balance between quietness and ventilation performance in each given situation. Its superb running smoothness. Reference-class sso2 bearing and noctua’s trusted premium quality make the nf-a20 an elite choice for the highest demands.Award-winning noctua quality in 20cm sizewhile more and more pc cases support 20cm intake. Side-panel or exhaust fans. Many of the bundled stock units and available aftermarket options are of questionable quality. By contrast. The nf-a20 is a true premium grade solution worthy of noctua’s award-winning a-series.154Mm. 110X180mm and 170mm hole spacingin order to ensure broad compatibility with today’s pc cases. The nf-a20 features three sets of mounting holes: while the 154x154mm and 110x180mm spacing allow it to replace most 200mm fans. The 170x170mm spacing is used by many 230 and 250mm fans. Which can thus also be replaced by the nf-a20.*Flow acceleration channelsthe nf-a20 impeller features suction side flow acceleration channels. By speeding up...