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Noctua NF-S12B FLX 120MM Ultra Quiet Cooling Fan 600-1200RPM 49.2-100.6M3/H 6.2-18.1DBA Molex

This product can only be exchanged or replaced with the exact same item.
Noctua NF-S12B FLX 120MM Ultra Quiet Cooling Fan 600-1200RPM 49.2-100.6M3/H 6.2-18.1DBA Molex - 1
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Noctua NF-S12B FLX 120MM Ultra Quiet Cooling Fan 600-1200RPM 49.2-100.6M3/H 6.2-18.1DBA Molex - 38379_l.jpg Noctua NF-S12B FLX 120MM Ultra Quiet Cooling Fan 600-1200RPM 49.2-100.6M3/H 6.2-18.1DBA Molex - 38379_1.jpg Customer Photos (0)
Reg. Price: $19.99  CAD
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   Shipping Weight:   0.4 lbs
   Part #: NF-S12B-FLX
 May We Also Suggest

Features    [ Edit | History ]
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, 6 years warranty and versatile 1200/900/600 rpm speed settings, the NF-S12B FLX is a premium quality fan that offers full flexibility in quiet to ultra-quiet case cooling.

More information:
button  NF-S12B Blade Design
button  NF-S12B & NF-P12: Technical Backgrounds
button  Which fan is right for me?

BBT Highly optimised impeller with Bevelled Blade Tips
Thanks to its further refined blade geometry with extended leading edges and Bevelled Blade Tips, the NF-S12B achieves up to 10% more airflow and static pressure than its much acclaimed predecessor at the same noise level. button

flx 3 speed settings for full flexibility
Providing 1200, 900 and 600 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise Adapters, the FLX (Flexibility) version can be fine-tuned for superior airflow or maximum quietness.

SCD Smooth Commutation Drive 2
The latest version of Noctua’s advanced SCD drive system ensures superb running smoothness by eliminating torque variations and switching noises. button

SSO SSO-Bearing
Noctua’s time-tested SSO-Bearing technology has become synonymous with supremely quiet operation and exceptional long-term stability. button

Specifications    [ Edit | History ]
Size 120x120x25 mm
Bearing SSO-Bearing
Blade Geometry NF-S12B Blade Design with BBT
Rotational Speed (+/- 10%) 1200 RPM
Rotational Speed with L.N.A. (+/- 10%) 900 RPM
Rotational Speed with U.L.N.A. (+/- 10%) 600 RPM
Airflow 100,6 m³/h
Airflow with L.N.A. 75,8 m³/h
Airflow with U.L.N.A. 49,2 m³/h
Acoustical Noise 18,1 dB(A)
Acoustical Noise with L.N.A. 10,6 dB(A)
Acoustical Noise with U.L.N.A. 6,2* dB(A)
Static Pressure 1,31 mm H2O
Static Pressure with L.N.A. 0,76 mm H2O
Static Pressure with U.L.N.A. 0,34 mm H2O
Input Power 1,2 W
Input Current 0,1 A
Voltage Range 12 V
MTBF > 150.000 h
Scope of Delivery 
  • Ultra-Low-Noise Adaptor (U.L.N.A.)
  • Low-Noise Adaptor (L.N.A.)
  • 4 Vibration Compensators
  • 3:4-Pin Adaptor
  • 4 Fan Screws

Noctua NF-S12B-FLX Customer Reviews

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Noctua NF-S12B-FLX reviews.
Experience: 3 Days
 Verified Owner
Quiet and move a lot of air
expensive, boring color
This fan is very quiet and move a lot of air.
I can only hear a little noise at max setting.
Though it costs a lot, but it's well worth it.
Would recommend to everyone who doesn't care about the color of the fan.

Experience: 3 Days
 Verified Owner
Vewy, vewy quiet
Not cheap
Excellent product. Does exactly what it is supposed to. Moves air. Replaced 2x Lian Li case fans and am very pleased.

Experience: 2 Weeks
 Verified Owner
Very quiet.
A bit expensive, but worth it.
I bought this fan to replace an Antec case fan that went dead. I couldn't beleive how quiet it was and when I first turned on my computer with the fan installed. I could barely hear it. I would definately buy this fan again when needed.

Experience: 19 Days
 Verified Owner
What you would expect from any Noctua fan. Quiet, lots of airflow, great quality case fan.
Wait for a sale. Twenty bucks is a steep price but you do get what you pay for.
I picked up two of the NF-S12B fans to replace two Coolermaster R4-L2R-20AC that barely lasted six months before they both started making noise.(Cheaper is not always better) Different blade configuration than the NF-P12 but they seem to work quite well as intake case fans. I am going to replace the exhaust fans as well on my case the next time these go on sale.

Experience: 1 Months
 Verified Owner
+Enough air flow for me
+Vibration dampers and lna/ulna adapters included
-Not much pressure
-Had one that vibrated(NCIX RMA'd)
-Now my power supply sounds loud
Picked up these fans for my FT03 case as intake/exhaust. They works as good as the stock fans and do so with much less noise.

One of the fans was causing the case to vibrate, but NCIX replaced it for me and the new one is all good.

Overall I would say these are good for a quieter system(silent if you use the ULNA and still quiet with the LNA). I am letting my board control them so they are very quiet at idle.

I would recommend these for system that value quiet over all else, while they perform very well for the noise level, they may not cope with some very hot systems and should not be used on tight fin heatsinks and rads(NF-P12 for those :)).

One down side to these fans is that you will notice anything else that is loud in the system after you get them installed.

Experience: 6 Months
Moves good amount of air as exhaust fan
Excellent accessories
Rubber gromets little difficult to install.
Bought for $9.99 on weekend sale about 6 months backs. Still working great. Tough to justify the $19.99 normal price though. Using in Antec 1200 case removed the dual 120 exhaust fans and replace with just a single of this fan temps are just as good. The accessories very useful. Needed to undervolt another fan where the MB couldn't used the Low voltage adapter worked perfectly.

Experience: 7 Days
 Verified Owner
Good airflow
Easy installation
Good fan for my case, case temp 24c. Silent, easy use, connector for selectable rpm...

Experience: 10 Days
 Verified Owner
*high quality
* cool
The only downside to these fans is that price. They do an amazing job cooling and make so little noise that it doesn't upset me. I would highly recommend these if price is not an issue.

Experience: 3 Weeks
 Verified Owner
Whisper quiet, efficient, well-made, sleeved cable
Colours are unremarkable, price is expensive
Overall I must admit I was plesantly surprised with this fan. I'm using this as an exhaust cooler on the rear of my case, since this fan is designed for 'open air' cooling, and not 'restrictive flow' cooling like in a CPU cooler. (If you want that, get the NF-P12-1300 instead.) I replaced a SilentX fan that had siezed after only a few years of use.

One of the things you will notice with this fan is that the blade angle is very high, almost 90 degrees. This makes it a great fan for moving air when there is no obstructions, although poor if there is an obstruction. Since they make two designs, they don't have to compromise with a fan blade design that is 'in the middle' of being good as a case fan, and being good as a CPU cooler. This fan does well at what it is designed to do, and when running the blades become nearly invisible. Nothing stands in the way of moving the air, which is why this fan excels at what it does.

Yes the cost is a bit high, but with a 6-year warranty this will be the last fan you need for quite some time.

Experience: 2 Days
 Verified Owner
This is the real deal. You need these fans in any silent case you want to build. They are the high-end fans of the market.
I know, they are twenty dollars each but I assure you they're worth every penny. Get them on sale and make your case silent.
These are excellent fans. In fact, the best I've ever had. I have used CoolerMaster noisy LEDy fans with lights and noise. Do yourself a favor and buy real fans. Buy Noctua fans.

 NCIX Forum Messages

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Messages about Noctua NF-S12B FLX 120MM Ultra Quiet Cooling Fan 600-1200RPM 49.2-100.6M3/H 6.2-18.1DBA Molex

Sale? (Prateem_S- Jul 03, 12, 8 Replies) Read this message
Sold out? (Randall_S- Mar 28, 10, 3 Replies) Read this message
Noctua's Latest Fan (KooKLooK- May 09, 09, 7 Replies) Read this message

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Forum messages are not reviewed and may not contain accurate information about a product. Message contents are opinions from customers based on their own experience with a product. We do not recommend you make puchasing decisions based on Forum messages.
Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Comment: OC Mod Shop review: The Noctua NF-S12B FLX is a well-built fan with a lot of innovation and thought behind it. It is on the pricier side, but these are also the Ferrarris in the case fan world
Posted by: BernardP @03/09/10
Comment: Complete review with nicely detailed technical info. HardwareBistro concludes that the NF-S12B is well made, quiet and efficient.
Posted by: BernardP @07/28/09
Comment: This site reviews the question you're asking. How does this fan compare to the Noctua NF-P12. Quite interesting.
Posted by: Spiffy_1 @05/14/09
Submit a review link   |   Latest 30 reviews
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NCIX provides a 30 day limited warranty on this product.  The remainder of the 1 year warranty is provided by the manufacturer.    Warranty length may vary depending on manufacturer and product.
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