Smooth Commutation Drive technology and SSO reference class bearings guarantee superbe runtime and excellent long-term stability. Modular cabling, optimum control, low-noise adapter and 6-year manufacturing guarantee make the NF-A4x20 a premium solution for the highest demands.
The features of the Noctua NF-A4x20 PWM at a glance:
Stylish brown makes for a noble look
Premium fan with aerodynamic design
Extremely low noise emission of max. 14.9 dB (A)
High static pressure of up to 2.26 mm H2O
High flow rate of max. 9.4 m³ / h
Connection via 4-pin PWM
Very high life expectancy of over 150,000 hours
Long warranty: 6 years
Small premium fan from Noctua
The PWM version differs from the conventional NF-A4x20 by the possibility to change the speed over pulse width modulation independent of the voltage. The PWM model of the A4x20 is equipped with Noctua's specially designed NE-FD1 IC for fully automatic speed control and is delivered with a low-noise adapter, which allows a maximum speed reduction from a maximum of 5,000 to 4,400 rpm. Its performance-oriented maximum speed and comprehensive speed control options and exceptional speed range make the NF-A4x20 PWM the ultimate solution for users who want to achieve a perfect balance between excellent cooling performance and super-quiet running, regardless of whether it's on heat sinks or the body ventilation!
The impeller of the NF-A4x20 PWM is equipped with flow acceleration channels on the suction side. 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. 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.
Noctua's 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 Noctur's SCD drive system ensures excellent run-down due to the elimination of torque fluctuations and switching noises. This makes the NF-A4x20 itself surprisingly quiet up close. The NF-A4x20 is equipped with the further optimized second generation Noctua's 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.
Noctuas fans are known for their makellose quality and outstanding longevity. Like all Noctua fans, the NF-A4x20 PWM has an MTBF specification of over 150,000 hours and comes with a full six-year manufacturing warranty.
Format: 40 x 40 x 20 mm
Storage Type: SSO2-Bearing
Leaf Geometry: A Series with Flow Acceleration Channels
Rotational. (+/- 10%): 5,000 rpm
Rotational. With L.N.A. (+/- 10%): 4.400 rpm
Rotational. Minimum (+/- 10%): 1,200 rpm
Flow rate: 9,4 m³ / h
Volume flow with L.N.A .: 8.3 m³ / h
Sound Emission: 14.9 dB (A)
Sound development with L.N.A .: 12.2 dB (A)
Static pressure: 2.26 mm H2O
Static pressure with L.N.A .: 1.75 mm H2O
Max. Power consumption: 0.6 W
Max. Current: 0.05 A
Operating voltage: 12 V
MTBF:> 150,000 h
Low-Noise Adapter (L.N.A.)
4-pin cable Y
30 cm cable extension
OmniJoin adapter set
NA-AV3 Anti-vibration mountings
4 fan screws
Manufacturer Warranty 6 years