Noctua NF-A4x20 5V fan - 40mm

The Smooth Commutation Drive technology and the SSO2 reference class bearing guarantee superbe stability and excellent long-term stability. Modular cabling, a low-noise adapter, the OmniJoin adapter set and a 6-year manufacturing guarantee make the NF-A4x20 5V a premium solution for the highest demands.
The features of the Noctua NF-A4x20 5V at a glance:

Stylish brown makes for a noble look
Premium fan with aerodynamic design
5V version with low operating voltage
Extremely low noise emission of 14.9 dB (A)
High static pressure of 2.26 mm H2O
High flow rate of 9.4 m³ / h
Connection via 3-pin PWM
Very high life expectancy of over 150,000 hours
Long warranty: 6 years
Small premium fan from Noctua

The impeller of the NF-A4x20 5V is equipped on the suction side with so-called flow acceleration channels. By accelerating the air flow in the critical outer regions of the fan blades, suction-side vortex detachments are reduced, resulting in higher efficiency and lower turbulence-induced noise emission. Thanks to an optimized, compact motor design, the hub area of the NF-A4x20 5V is considerably smaller than conventional 4cm fans. This allows a larger blade area to be achieved, which contributes to the superior pressure and delivery capacity of the NF-A4x20 5V. By a double construction depth compared to the NF-A4x10, the pressure and delivery capacity was increased, making the fan perfect for applications with higher air resistance.

Noctuas Advanced Acoustic Optimization (AOO) frames have built-in vibration buffers, stepped inlet design, and internal surface microstructures that provide even better performance / noise efficiency. The stepped inlet area of the Stepped Inlet design creates more turbulence in the inflow. This facilitates the transition from laminar to turbulent flow, which is better adhered to the frame (flow attachment) and thus, especially with limited suction area, increases the suction capacity of the fan.

The microstructure inside the inner surface (Inner Surface Microstructures) creates a boundary layer through which the tips of the fan blades move. This reduces the current dissipation from the suction side of the blade tips, which results in a considerable reduction in the rotary sound as well as an increase in the pressure and air flow efficiency. The anti-vibration pads made from extra-soft silicone reduce the transmission of minimal vibrations and are compatible with all standard screws as well as standard mounting systems or fan brackets used with CPU coolers.

The latest, advanced version of Nocturs SCD drive system ensures excellent run-down due to the elimination of torque fluctuations and switching noises. This makes the NF-A4x20 5V itself very close up very close up. The NF-A4x20 5V is equipped with the further optimized second generation of Nocturas proven SSO bearing system. With SSO2, the backside magnet is closer to the fan axis, resulting in even better stabilization resulting in further improved precision and durability.

Because many devices that use 40mm fans have proprietary fan connectors, the NF-A4x20 5V is shipped with Noctuas OmniJoin adapter set. Simply cut off the cable of the original fan, attach it with the included 3M Scotchlok ?? Terminals on the adapter and already you can operate the NF-A4x20 5V also at proprietary connections! While the 20 cm short primary cable in typical applications helps to avoid cables, the supplied 30 cm extension provides extra range for all cases. Both cables are completely jacketed.

Noctuas fans are known for their makellose quality and outstanding longevity. Like all Noctua fans, the NF-A4x20 5V has an MTBF specification of over 150,000 hours and comes with a full six-year manufacturing warranty.

Attention: As a 5V fan the NF-A4x20 5V can not be operated with 12V! Operation at standard 12V current sources such as fan connections of PC mainboards will damage the fan.

Delivery:
30 cm cable extension
OmniJoin ?? Adapter Set
NA-AV3 Anti-vibration mountings
4 fan screws

Manufacturer Warranty 6 years