LOGISTICAL DATAS
Product Labeling
Noctua NF-A4x20 PWM
EAN-No.
901001810010-5
UPC-No.
84150011010-9
Dimensions (HxWxD)
210 x 150 x 34
Weight
185 gr
Warranty
6 Years
MSPR
14.95 USD
Packaging Unit
40 Pcs.
Dimensions / Unit (HxWxD)
395 x 380 x 380 mm
Weight / Unit
9.2 kg
Noctua NF-A4x20 PWM
Premium Fan
NF-A4x20 PWM
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 PWM is a highly optimised, premium-quality
quiet fan in size 40x20mm. The PWM version sports Noctua’s custom-designed NE-FD1 IC for fully automatic speed control via 4-pin fan headers and comes with a Low-Noise
Adaptor as well as an OmniJoin™ Adaptor Set for easy connection to proprietary fan headers. Its superb running smoothness, reference-class SSO2 bearing and Noctua’s
trusted premium quality make it an elite choice for the highest demands.
40x20mm size
Compared to Noctua’s award-winning NF-A4x10, the NF-A4x20 is twice as thick, which allows for
increased static pressure performance and makes the NF-A4x20 ideal for demanding applications
with high flow resistance.
Flow Acceleration Channels
The NF-A4x20 PWM impeller features suction side Flow Acceleration Channels. By speeding up
the airflow at the crucial outer blade regions, this measure reduces suction side flow separation
and thus leads to better efficiency and lower vortex noise.
AAO Frame
Noctua’s AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as
well as Noctua’s proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which
further refine the fan’s performance/noise efficiency.
Inner Surface Microstructures
With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface
Microstructures, flow separation from the suction side of the blades is significantly suppressed,
which results in reduced blade passing noise and improved airflow and pressure efficiency.
Integrated Anti-Vibration Pads
Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of
minute vibrations while maintaining full compatibility with all standard mounting systems
and fan clips used on heatsinks.
OmniJoin Adaptor Set
Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20 PWM
comes with Noctua’s OmniJoin Adaptor Set. Just cut the original fan’s cable, fix it to the
adaptor using the supplied 3M Scotchlok™ connectors and you can plug the NF-A4x20
PWM to proprietary fan headers!
6-year manufacturer’s warranty
Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all
Noctua fans, the NF-A4x20 PWM features an MTTF of more than 150.000 hours rating
and comes with a full 6-year manufacturer’s warranty.
SCOPE OF DELIVERY
NF-A4x20 PWM Premium Fan
Low-Noise-Adaptor (L.N.A.)
OmniJoin Adaptor
4-pin y-cable
30cm extension cable
NA-AV3 anti-vibration mounts
Fan screws
40 mm
Stepped Inlet Design
Noctua’s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition
from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment
and increases suction capacity, especially in space restricted environments.
Custom designed PWM IC with SCD
Supporting fully automatic PWM speed control, the NF-A4x20 PWM uses Noctua’s custom
designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology. By
providing smoother torque impulses, SCD suppresses PWM switching noises and thus makes the
fan quieter at low speeds.
SSO2 Bearing
The NF-A4x20 PWM features the further optimised second generation of Noctua’s renowned,
time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide
even better stabilisation, precision and durability.
Designed in Austria, Noctua’s premium cooling components are internationally renowned for their superb quietness, exceptional performance and thoroughgoing quality. Having received more
than 6000 awards and recommendations from leading hardware websites and magazines, Noctua’s fans and heatsinks are serving hundreds of thousands of satisfied customers around the globe.
SPECIFICATIONS
Size
Bearing
Connector
Blade geometry
Max. input power / operating voltage
MTTF
NF-A4x20 PWM
Max. rotational speed (+/-10%)
Max. airflow
Max. acoustical noise
Max. static pressure
40 x 40 x 20 mm
SSO2
4-Pin
A-Series with Flow Acceleration Channels
0.6W / 12V
> 150.000 h
w/o adaptor
5000 RPM
9.4 m³/h
14.9 dB(A)
2.26 mm H
with L.N.A.
4400 RPM
8.3 m³/h
12.2 dB(A)
O
2
1.75 mm H
O
2
www.noctua.at
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