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Brown 120mm square case fan with nine curved blades and soft silicone anti-vibration corners

Noctua

Noctua NF-S12A FLX 120mm 3-pin case fan 1200/900/700 RPM Brown

SKU CH-495X-0K3KB MPN NF-S12A FLX

120 mm case fan with three speed settings up to 1200 RPM and noise as low as 7.4 dB(A)

  • Fan size120 mm
  • Number of fans1 Fan
  • Fan controlNo Controller
  • Fan depth25 mm
  • Bearing designSSO2
  • Rotational speed1,200 RPM +/-10% 900 RPM +/-10% (with L.N.A adapter) 700 RPM

LED Non-LED

Model FLX

  • Near-silent 7.4 dB(A) operation with U.L.N.A. adaptor
  • 27 CFM maximum airflow at 1200 RPM standard speed
  • Three selectable speeds via included L.N.A. and U.L.N.A. adaptors
  • SSO2 bearing rated for over 150,000 hours MTTF
  • Anti-vibration pads and 3:4-pin adaptor included for versatile mounting

Premium quiet 120mm case fan

The Noctua NF-S12A FLX is a 120mm case fan designed for quiet cooling in PC cases, CPU coolers and water-cooling radiators. It uses a third-generation S12 blade design with Anti-Stall Knobs and an Advanced Acoustic Optimisation frame. The fan targets builders who want low noise without sacrificing airflow. It is not suited for buyers who need addressable RGB lighting or PWM speed control.

Tool-free vibration mounts and adaptors

Installation uses the supplied 25mm thick frame with integrated anti-vibration pads and four vibration compensators for screw mounting. A 3:4-pin adaptor, 30cm extension cable, Low-Noise Adaptor and Ultra-Low-Noise Adaptor are included for flexible power connections. The 3-pin connector limits automatic speed control on motherboards that only support PWM headers. Builders without 3-pin headers or fan controllers must plan their wiring carefully.

Three fixed speeds for airflow or silence

At 1200 RPM the fan delivers 63.27 CFM at 17.8 dB(A). The Low-Noise Adaptor reduces speed to 900 RPM for 48.97 CFM at 10.7 dB(A). The Ultra-Low-Noise Adaptor drops it to 700 RPM for 38.73 CFM at 7.4 dB(A). This range handles typical case intake and exhaust duties with headroom for quiet operation. It runs out of steam in high-restriction radiators that demand higher static pressure at maximum speed.

How it compares

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

Price $19.99
Typical for this category: the median of 8,339 items is $19.99.
Fan size 120 mm
Typical for this category: the median of 1,114 items is 120 mm.

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Specifications

Product
Brand nameNoctua
Model nameNF-S12A FLX
Product typeCase Fan
Product colorBrown
Performance
Rotational speed1,200 RPM +/-10%
900 RPM +/-10% (with L.N.A adapter)
700 RPM +/-10% (With U.L.N.A)
Airflow rate63.27 CFM (standard)
48.97 CFM (w/L.N.A.)
38.73 CFM (w/U.L.N.A.)
Power
Power input connector3 Pin
Size & build
Fan size120 mm
Number of fans1 Fan
Fan depth25 mm
Bearing designSSO2
Product dimensions120 × 120 × 25 mm
Shipping weight0.29 kg
Package size211 × 152 × 38 mm
Compatibility
Compatible withCPU Cooler, Water-Cooling Radiator and Case
In the box
In the boxLow-Noise Adaptor (L.N.A.)
Ultra-Low-Noise Adaptor (U.L.N.A.)
3:4-Pin Adaptor
30 cm Extension Cable
4 Vibration-Compensators
4 Fan Screws
Environment & compliance
Operating noise17.8 dB(A) standard
10.7 dB(A) (w/ L.N.A )
7.4 dB(A) (w/U. L.N.A)
More details
Fan controlNo Controller
LED lightingNon-LED

Other versions of this model

2 more in the same range

Questions about this item

How can I verify the NF-S12A FLX is running at the correct speed after installation?

Use motherboard monitoring software or BIOS to confirm the 3-pin fan reports approximately 1200 RPM, 900 RPM with the Low-Noise Adaptor, or 700 RPM with the Ultra-Low-Noise Adaptor, each within the stated +/-10% tolerance.

What accessories are included with the NF-S12A FLX and what must I provide separately?

The box contains the 120mm fan, Low-Noise Adaptor, Ultra-Low-Noise Adaptor, 3:4-pin adaptor, 30cm extension cable, four vibration-compensators and four fan screws; only a 3-pin or 4-pin motherboard header or PSU Molex connector is required from your side.

Which of the three speed settings should I choose for the NF-S12A FLX?

Run at 1200 RPM for maximum airflow of 63.27 CFM at 17.8 dB(A), 900 RPM via the L.N.A. for 48.97 CFM at 10.7 dB(A), or 700 RPM via the U.L.N.A. for 38.73 CFM at 7.4 dB(A) depending on cooling needs.

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