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Brown 120mm square case fan with black blades and 4-pin connector

Noctua

Noctua NF-S12A PWM 120mm 25mm 4-Pin Case Fan

SKU CH-NPZ8-MM8J1 MPN NF-S12A PWM

120mm PWM case fan with 1200 RPM maximum speed and 17.8 dB(A) noise level for quiet cooling

  • 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) 300 RPM
  • Airflow rate107.5 m3/h (standard) 83.2 m3/h (w/L.N.A.)

LED No

Model PWM

  • Quiet operation at 10.7 dB(A) with Low-Noise Adaptor fitted
  • 4-pin PWM enables automatic 300–1200 RPM speed control
  • 5 m³/h airflow for efficient case ventilation
  • SSO2 bearing rated beyond 150000 hours MTTF
  • Anti-vibration pads and mounts reduce transmitted vibration

Quiet 120mm PWM case fan

The Noctua NF-S12A PWM is a 120mm square, 25mm thick case fan designed for silent operation in desktop PCs. It uses a 4-pin PWM connector for automatic speed control and runs at a maximum of 1200 RPM with a noise level of 17.8 dB(A). The brown coloured fan includes anti-vibration pads and a Low-Noise Adaptor for quieter running.

Upgrade from louder or smaller fans

This model replaces older 120mm fans that lack PWM control or produce higher noise at similar airflow. The jump is worth it when building a quiet workstation or silencing an existing chassis where the fan will run continuously at low speeds. It is not suited for builds that require high static pressure for dense radiator fins or restrictive mesh panels.

Airflow capacity and limits

At full speed the fan delivers 107.5 m3/h of airflow, dropping to 83.2 m3/h with the Low-Noise Adaptor limiting speed to 900 RPM. The PWM range extends down to 300 RPM for near-silent idle. The SSO2 bearing is rated for over 150000 hours MTTF. It will not match the static pressure of dedicated radiator fans in high-restriction liquid cooling loops.

How it compares

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Price $20.99
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Specifications

Product
Brand nameNoctua
Model nameNF-S12A PWM
Product typeCase Fan
Product colorBrown
Performance
Rotational speed1,200 RPM +/-10%
900 RPM +/-10% (with L.N.A adapter)
300 RPM +/-10% Min Rotation Speed (PWM)
Airflow rate107.5 m3/h (standard)
83.2 m3/h (w/L.N.A.)
Power
Power input connector4 Pin
Size & build
Number of fans1 Fan
Fan depth25 mm
Bearing designSSO2
Product dimensions120 × 120 × 25 mm
Shipping weight0.30 kg
Package size211 × 152 × 39 mm
Compatibility
Compatible withCPU Cooler, Water-Cooling Radiator and Case
Environment & compliance
Operating noise17.8 dB(A) standard
10.7 dB(A) (w/ L.N.A)
More details
Fan controlNo Controller
LED lightingNo

Other versions of this model

2 more in the same range

Questions about this item

What are the exact dimensions and screw-hole spacing for mounting this 120mm fan?

The frame measures 120 x 120 x 25mm with standard 120mm mounting holes; four anti-vibration pads and four screws are included for case or radiator installation.

How do I connect the 4-pin PWM connector and the supplied Low-Noise Adaptor for automatic speed control?

Plug the fan's 4-pin connector into a motherboard PWM header; insert the Low-Noise Adaptor between fan and header to limit maximum speed to 900 RPM while retaining PWM control down to 300 RPM.

When should I expect to replace the SSO2 bearing, and what indicates it is wearing out?

The SSO2 bearing is rated for more than 150000 hours MTTF; rising noise above the specified 17.8 dB(A) or increased vibration suggests bearing wear and the need for replacement.

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