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Small brown 40x10mm case fan with 3-pin connector and anti-vibration pads

Noctua

Noctua NF-A4x10 FLX 40x10mm 3-pin case fan

SKU CH-TJNJ-8PHEQ MPN NF-A4x10 FLX

A 40x10mm 3-pin case fan with Flow Acceleration Channels and SSO2 bearing, running at 4500 RPM or 3700 RPM with the Low-Noise Adaptor for 17.9 dB(A) or 12.9 dB(A) noise

  • Fan size40 mm
  • Number of fans1 Fan
  • Fan controlNo Controller
  • Fan depth10 mm
  • Bearing designSSO2
  • Rotational speedRotational Speed (+/- 10%): 4,500 RPM Rotational Speed with

Model FLX

  • Premium quiet cooling with advanced aerodynamic design
  • Near-silent operation at 12.9 dB(A) using Low-Noise Adaptor
  • Flexible speed control: 4500 RPM or 3700 RPM via supplied adaptor
  • Compact 40x10mm size fits 3D printers, NAS, routers
  • Over 150000 hours MTTF for long-term reliability

Compact quiet cooling for tight spaces

The Noctua NF-A4x10 FLX is a 40x10mm case fan built for devices where space is at a premium. It suits 3D printers, NAS units, routers, switches and other small-form-factor hardware that rely on a 12V 3-pin header. The low-noise adaptor lets you choose between two speed settings without extra software. Builders needing larger airflow or PWM control should look elsewhere.

Build quality and daily mounting

An SSO2 bearing and Smooth Commutation Drive 2 provide smooth, stable rotation over a rated 150000 hours. The AAO frame adds integrated anti-vibration pads, Stepped Inlet Design and Inner Surface Microstructures. Flow Acceleration Channels on the impeller improve efficiency at the blade tips. The box includes vibration compensators, screws, a 30cm extension cable, a 3:2 pin adaptor and an OmniJoin adaptor set for proprietary headers.

Thermals noise and power in normal use

At full speed the fan spins at 4500 RPM, moves 4.83 CFM and produces 17.9 dB(A). With the low-noise adaptor fitted it runs at 3700 RPM, delivers 3.88 CFM and drops to 12.9 dB(A). The 3-pin connector draws 12V directly from the header, so power draw stays minimal. No LED lighting means no extra current for illumination.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 63% of the 8,339 comparable items (median $19.99).
Fan size 40 mm
Lower than about 90% of the 1,114 comparable items (median 120 mm).

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Specifications

Product
Brand nameNoctua
Product lineA-Series
Model nameNF-A4 × 10
Product typeCase Fan
Product colorBrown
Performance
Rotational speedRotational Speed (+/- 10%): 4,500 RPM
Rotational Speed with L.N.A. (+/- 10%): 3,700 RPM
Airflow rateAirflow: 4.83 CFM
Airflow with L.N.A.: 3.88 CFM
Power
Power input connector3 Pin
Size & build
Fan size40 mm
Number of fans1 Fan
Fan depth10 mm
Bearing designSSO2
Product dimensions40 × 40 × 10 mm
Shipping weight0.16 kg
Package size212 × 152 × 37 mm
Compatibility
Compatible withCase
In the box
In the boxLow-Noise Adaptor (L.N.A.)
3:2 Pin Adaptor
OmniJoin Adaptor Set
30 cm Extension Cable
4 Vibration-Compensators
4 Fan Screws
Environment & compliance
Operating noiseAcoustical Noise: 17.9 dB(A)
Acoustical Noise with L.N.A.: 12.9 dB(A)
More details
Fan controlNo Controller
LED lightingNo

Questions about this item

How fast does the 3-pin connector run the NF-A4x10 FLX, and what airflow does it deliver at that speed?

The fan spins at 4500 RPM on the 3-pin 12 V header, moving 4.83 CFM of air at 17.9 dB(A).

What mounting holes and clearance does the 40x10 mm frame need?

It fits standard 40 mm square mounting holes and requires 10 mm depth; four vibration compensators and four screws are included.

How do I install the Low-Noise Adaptor to drop the speed to 3700 RPM?

Plug the L.N.A. between the fan’s 3-pin plug and the motherboard header; the fan then runs at 3700 RPM and 3.88 CFM for 12.9 dB(A).

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