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NF-S12B ULN Ultra Low Noise 120mm Cooling Fan, 500/700 RPM
(4 reviews)

Noctua NF-S12B ULN Ultra Low Noise 120mm Cooling Fan, 500/700 RPM

- Replaces the Noctua NF-S12 800 RPM 120mm Quiet Case Fan- Replaced by the Noctua NF-S12A ULN 12V 800RPM 120mm Ultra Low Noise Cooling Fan

The NF-S12B ULN is a premium quality fan for ultra-low-noise applications where maximum quietness has top priority.

Succeeding the vastly successful NF-S12, the NF-S12B is a next generation quiet fan featuring Noctua's advanced SCD2 technology as well as a highly optimised blade geometry with Bevelled Blade Tips that improves its award-winning predecessor's airflow efficiency by up to 10%. Topped off with Noctua's time-tested SSO-Bearing, six years warranty and super-slow 700/500 RPM speed settings, the NF-S12B ULN is a premium quality fan for ultra-low-noise applications where maximum quietness has top priority.


  1. Highly optimised impeller with Bevelled Blade Tips
  2. Two speed settings for maximum quietness
  3. Smooth Commutation Drive 2
  4. SSO-Bearings
  5. Noise levels from only 5 dB(A)
  6. Six year warranty

SpecificationsNF-S12B ULN
Size120x120x25 mm
Blade GeometryNF-S12B Blade Design with BBT
Rotational Speed ±10%700 RPM
Rotational Speed with U.L.N.A. ±10%500 RPM
Airflow33.5 CFM
Airflow with U.L.N.A.22.5 CFM
Acoustical Noise6.8 dB(A)
Acoustical Noise with U.L.N.A.5 dB(A)
Static Pressure0.44 mm H2O
Static Pressure with U.L.N.A.0.23 mm H2O
Input Power0.6 W
Input Current0.05 A
Voltage Range12 V
MTBF> 150.000 h
Warranty72 months
EAN barcode4716123313311

Customer Reviews

Not silent - but very quiet


I've installed 2 of these to replace the stock fans in a Fractal Design R3 case - which were quite intrusive. The result is a much quieter PC that now just emits a low frequency noise rather than the whine and buzz of the stock fans.

A review


Looked at it the wrong way and one of the spokes fell off. Solved the resulting vibration problem by letting it hang nonchalantly from a single plastic fastener, where it swings back and forth looking preposterous while reducing the case temperature by a few degrees. I've given it 10 out of 10, as it's the best swinging, spoke-challenged fan in its class.

Quiet PC replied on 9th August 2011

Many thanks for the humorous review and sorry to hear about the fan. If you would like it to be replaced under warranty do get in touch.

Great fan


Can't believe I didn't upgrade sooner. This is very, very quiet, easy to install and comes with all the bits you are likely to need. Highly recommended. Also the postage of the item was super quick, thanks Quiet PC!

Excellent Product


I currently have two of these connected to my fan controller and I can get RPMs down to 260- at these speeds they really are silent, even with your head directly next to the case. Naturally, airflow suffers at this RPM but as most of us know, just a little airflow makes all the difference over HDDs etc

When cranked right up they are noticeable but never really distracting. It's a very 'even' sound that most people would get accustomed to. In all practicality, you would only ever need to turn these right up when gaming. You then wouldn't be able to hear them over the sounds from your game so this shouldn't matter on a day-to-day basis.

In an Antec P183 case (as is the case with my set up) with it's excellent sound dampening properties, you could easily afford to have these at a respectable RPM without noticing a difference in noise levels.

To summarise, this is a perfect case fan if you want silence at the expense of high airflow.


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