Noctua NF-A4x20 FLX Fan 40mm
Noctua NF-A4x20 FLX Fan 40mm, photo 2
Noctua NF-A4x20 FLX Fan 40mm, photo 3
Noctua NF-A4x20 FLX Fan 40mm, photo 4
Noctua NF-A4x20 FLX Fan 40mm, photo 5
Noctua NF-A4x20 FLX Fan 40mm, photo 6
Noctua NF-A4x20 FLX Fan 40mm, photo 7
Noctua

Noctua NF-A4x20 FLX Fan 40mm

SKU HC-106406MPN NF-A4x20 FLX

  • 40 mm
  • 3 Pin

Highlights

  • 40x20mm size with Flow Acceleration Channels and AAO frame
  • Three speed settings: 3,700, 4,400, and 5,000 RPM via adapters
  • Airflow 6.9 to 9.4 m³/h, static pressure 1.23 to 2.26 mmH2O
  • Noise level 8.5 to 14.9 dB(A) with Smooth Commutation Drive 2
  • SSO2 bearing rated over 150,000 hours MTTF
  • OmniJoin adapter set with 3M Scotchlok connectors included

Key specs

Size
40 mm
Fans in pack
1
Connector
3 Pin
RGB lighting
No
Color
Beige
Min. Fan RPM
3700 rpm
All specifications
$12.99
  • ≈ 0.0001701 BTC
  • ≈ 0.005735 ETH
  • ≈ 13.01 USDT

In stock Ships by Tue, Nov 10 when paid today.

  • Delivery to the United States: $39.90 DHL Express Worldwide · arrives Wed, Nov 11 – Mon, Nov 16 if paid today
  • Rate locked at checkout Up to 60 min to send BTC, 30 min for ETH and USDT
  • New, sealed and genuine Manufacturer warranty: 6 years
  • 30-day returns Unused items in original packaging
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Overview

The NF-A4x20 FLX is a 40x20mm premium quiet fan designed for high-resistance cooling. It suits builders who need strong static pressure in tight spaces.

Design and Build

The fan measures 40 by 40 by 20 millimeters in a beige and brown finish. Its AAO frame integrates anti-vibration pads, Stepped Inlet Design, and Inner Surface Microstructures to reduce turbulence and vibration transmission.

Performance

Flow Acceleration Channels on the impeller improve efficiency and lower vortex noise. The SSO2 bearing places the rear magnet closer to the axis for better stabilization. Smooth Commutation Drive 2 eliminates torque variation and switching noise.

Speed Control and Connectivity

Low-Noise and Ultra-Low-Noise adapters provide three fixed speeds. A 20-centimeter primary cable and 30-centimeter extension are fully sleeved. The OmniJoin set with 3M Scotchlok connectors enables attachment to proprietary headers, and a 3-to-4-pin adapter allows direct PSU connection.

What Is Included

The package contains the NF-A4x20 FLX fan, Low-Noise and Ultra-Low-Noise adapters, a 30-centimeter extension cable, a 3-to-4-pin adapter, the OmniJoin adapter set with 3M Scotchlok connectors, and mounting screws.

NF-A4x20 FLX Fan 40mm specifications

General
BrandNoctua
Manufacturer part no.NF-A4x20 FLX
EAN9010018100112
Warranty6 years (manufacturer)
Fan Specifications
Fan Size40 mm
Fan mounting size40 mm
Min. Fan RPM3700 rpm
Max. Fan RPM5000 rpm
Min. Single Fan Airflow6.9 m³/h
Max. Single Fan Airflow9.4 m³/h
Min. Static Pressure1.23 mmH2O
Max. Static Pressure2.26 mmH2O
Power Specifications
Rated voltage12 V
Noise
Min. Single Fan Noise8.5 dB(A)
Max. Single Fan Noise14.9 dB(A)
Internal Ports
Fan connectors3 Pin
Lighting
Lighting / RGBNo
Color
Primary ColorBeige
Secondary ColorBrown
Dimensions
Length / Depth40 mm
Width40 mm
Fan height20 mm

Specifications come from the manufacturer and can change without notice. Check the box contents and compatibility before ordering; our team answers questions within one business day.

Shipping & returns

Delivery to the United States: $39.90DHL Express Worldwide · arrives Wed, Nov 11 – Mon, Nov 16 if paid today

Ships from our warehouse in Germany: in stock, it leaves within 1–2 business days, tracked to the door.
ToBusiness daysThis item
GermanyDHL Paket1–2$5.90
Other EU countriesDHL Parcel International2–8$11.90–$15.90
UK, Switzerland and NorwayDHL Parcel International3–7$24.90
United States and CanadaDHL Express Worldwide2–5$39.90
Asia and the Middle EastDHL Express Worldwide2–5$49.90
Australia and New ZealandDHL Express Worldwide3–6$59.90
  • Discreet packaging Plain, unbranded box — no crypto or brand references outside
  • Returns 30 days for unused items in original packaging; faulty items are on us
Rates and delivery times by country

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