Hi, should I get this or the Noctua NF-F12 for a case fan? Thanks.

If your fan location doesn't have any filters or obstructions then the S12a will be what you want, but if it does have any sort of filter, or resistance the fan has to pull through, you'll want an NF-P12. Several reviews have remarked that in a resistance based location the P12 works just as well as the F12, and does so with less noise. The F12 would only be better for high temp heatsinks with its higher RPM range.I personally own all 3 types and have an F12 on my CPU heatsink, 2 P12 fans as intakes that are behind a dust filter, and 1 S12a as a rear exhaust. I previously used 2 S12as as the intakes but they were really loud behind the filters.

What is the difference between the PWM, the ULN and the FLX versions?

PWM is the most standard version. People who want to push a little extra air but still stay quiet and keep up with a mild overclock, these are also 4 pin.ULN is targeting users who hate sound. These are lower voltage and push less air.FLX is the dynamic fan, you can run it a little higher or lower watt and push a littler higher or lower air.Personally I can't see any reason to use anything but PWM. They even come with a free adapter to lower the voltage if for some insane reason this already super quiet fan isn't quiet enough.

What is the cfm at min and max rpms?

For a given RPM there is a performance curve; Maximum CFM at minimum static pressure, minimum CFM at maximum static pressure and all the points in between.

Are these sealed bearing fans?

From the Noctua FAQ:In order to ensure flawless operation over many years of usage, all Noctua fans come with a premium grade SSO bearing, which is fully sealed to prevent the entering of fine dust particles. Please note that the fan is not designed to be taken apart by the user. Removing the impeller from the frame will break the sealing of the bearing and results in a loss of warranty.

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🌀 Cool your rig, not your vibe — the silent powerhouse you deserve!

ROBUST BUILD QUALITY - Crafted with premium metal and silicon components to ensure long-lasting, vibration-free operation.
PRECISION PWM CONTROL - Dynamic 4-pin PWM lets you fine-tune fan speed for optimal cooling and energy efficiency.
UNIVERSAL COMPATIBILITY - Seamlessly fits desktops and servers with a standard 120mm size and 12V power input.
AWARD WINNING RELIABILITY - Join the elite with a fan that’s earned 250+ international accolades for unmatched quality and durability.
WHISPER QUIET PERFORMANCE - Experience near-silent airflow at just 17.8 dB—your workspace stays calm, your system stays cool.

The Noctua NF-S12A PWM is a premium 120mm cooling fan featuring a maximum speed of 1200 RPM and ultra-quiet 17.8 dB noise output. Equipped with advanced SSO2 bearing technology and a 4-pin PWM connector, it offers precise speed control and exceptional durability. Designed for desktops and servers, this award-winning fan combines metal and silicon materials for reliable, vibration-free cooling.

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Brand	Noctua
Power Connector Type	3-Pin
Voltage	12 Volts
Cooling Method	forced air
Compatible Devices	Desktop, Server
Noise Level	17.8 dB
Material	Metal
Maximum Rotational Speed	1200 RPM
UPC	808111663660 863121543098 731215276828 846764214297 807320183181 842431014252 809394261574 803982961709
Global Trade Identification Number	04716123314929
Manufacturer	Noctua
Number of Items	1
Item Height	6 Inches
Item Width	1.5 Inches
Product Dimensions	21.59 x 3.81 x 15.24 cm; 181.44 g
Item model number	NF-S12A PWM
Computer Memory Type	DIMM
Are Batteries Included	No
Country of Origin	USA
Item Weight	181 g

Noctua NF-S12A PWM, Premium Quiet Fan, 4-Pin (120mm, Brown)

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