Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)
The NF-A4x20 is a highly optimised quiet 40×20 mm fan in premium quality, which uses future-oriented construction measures such as Flow Acceleration Channels as well as Noctua’s AAO frame system. The FLX version offers three speed settings via the included low-noise adapter (5000/4400/3700rpm) and thus ensures full flexibility between maximum flow rate and almost silent operation. Its excellent smoothness, the SSO2 reference class bearing and Noctua’s proven premium quality make the NF-A4x20 a sophisticated choice for the highest demands.
40 x 20 mm format.
Compared to Noctua’s award-winning NF-A4x10, the NF-A4x20 has double the depth. This allows for higher printing performance and makes the NF-A4x20 the perfect choice for higher air resistance applications.
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Flow acceleration channels.The impeller of the NF-A4x20 is equipped with so-called flow acceleration channel. By accelerating airflow in critical external regions of the fan blades, suction side vortex detachment, resulting in higher efficiency and lower turbulence-related noise emission. | SSO2 bearing system.The NF-A4x20 is equipped with the further optimised second generation of Noctua’s proven SSO bearing system. With SSO2, the rear magnet sits closer to the fan axis, resulting in even better stabilisation, resulting in further improved precision and durability. | Integrated anti-vibration pads.Made from extra-soft silicone, the anti-vibration pads reduce the transmission of minimal vibrations and are also compatible with all standard screws as well as standard mounting systems or fan clips used in CPU coolers. | Box contents:Low-noise adapter (L.N.A. Ultra-low noise adapter (U.L.N.A. OmniJoin 4-pin Y-cable, 30 cm cable extension, adapter set, NA-AV3, anti-vibration attachments, fan screws. |
AAO frame system.
Noctua’s AAO (Advanced Acoustic Optimisation) frames have integrated vibration buffer as well as a stepped inlet area and an internal micro-structure (inner surface microstructures) that allow even better performance/noise efficiency.
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| Connection & Pin Configuration | 4-pin PWM. | 3-pin. | 4-pin PWM. | 3-pin. |
| Operating voltage: | 12 V. | 12 V. | 5 V. | 5 V. |
| RPM. | Max. 5000 / min: 1000. | 5000. | Max. 5000 / min: 1000. | 5000. |
| RPM with L.N.A. | 4400. | 4400. | – | – |
| RPM with U.L.N.A. | – | 3700. | – | – |
| Noise: | 14.9 dB(A). | 14.9 dB(A). | 14.9 dB(A). | 14.9 dB(A). |
| Noise with L.N.A. | 12.2 dB(A). | 12.2 dB(A). | – | – |
| Noise with U.L.N.A. | – | 8.5 dB(A). | – | – |
| Format: | 40 x 40 x 20 mm. | 40 x 40 x 20 mm. | 40 x 40 x 20 mm. | 40 x 40 x 20 mm. |
| Weight: | 180 g |
| Dimensions: | 4 x 2 x 4 cm; 180 Grams |
| Brand: | Noctua |
| Model: | NF-A4x20 FLX |
| Colour: | Beige / brown |
| Batteries Included: | No |
| Manufacture: | NOCTUA |
| Colour: | Beige / brown |
easy to work out what connectionsto use even though a good selection of connectors are supplied with fan. only gave 4 stars for noise even though it is very quiet no fan can be totally silent. much better than fan originally fitted.
These fans are brilliant so easy to install and now my USG is silent 5 STARS