NF-A14x25 G2 LS-PWM 800RPM 140mm Next Gen Fan $38.15 New 80 in stock	Add to Basket
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Noctua NF-A14x25 G2 LS-PWM 800RPM 140mm Next Gen Fan

The NF-A14x25 G2 is Noctua’s next-generation 140mm flagship fan, combining advanced engineering, ultra-quiet performance, and premium materials to deliver exceptional cooling in both airflow- and pressure-focused applications.

Features

Centrifugal Turbulator hub design
Time-tested SSO bearings
Ultra-tight tip clearance of 0.7mm
Highly optimised P/Q curve for all applications
800 RPM, 48.0 CFM, 11.4 dB(A)

Building on the success of the NF-A14 and the innovations of the NF-A12x25, Noctua’s NF-A14x25 G2 is a next-generation, square-frame 140mm flagship fan crafted from Sterrox LCP. Its advanced Progressive-Bend impeller with winglets, Flow Acceleration Channels, and Centrifugal Turbulator hub—paired with a remarkably tight 0.7mm tip clearance—delivers enhanced quiet cooling performance. Designed as a true all-rounder, it excels in both low-impedance, airflow-oriented applications like case ventilation, and high-impedance scenarios requiring strong static pressure, such as on heatsinks and radiators. The pre-installed NA-AVG2-LR anti-vibration gasket ensures a secure seal on radiators, while the AAO frame can be paired with the optional NA-IS1-14 inlet spacer to improve suction acoustics and airflow in challenging intake configurations.

The 4-pin LS-PWM version is a low-speed, PWM-enabled model ideal for semi-passive or ultra-quiet systems requiring precise speed control and near-silent operation. Its etaPERF motor with Smooth Commutation Drive 2 technology offers outstanding energy efficiency and smooth running, meeting the demands of even the most noise-sensitive users. Combined with Noctua’s premium SSO2 bearing and an extensive accessory package, the NF-A14x25 G2 sets a new benchmark in cooling performance, making it a top-tier choice for discerning enthusiasts and professionals alike.

Centrifugal Turbulator hub

Acting as a turbulator, the new Centrifugal Turbulator hub design improves flow attachment in the hub region. At the same time, it’s centrifugal driving motion pushes air outwards from the hub area where efficiency is low due to the slow rotational speed towards the outer, high-efficiency zones of the blades, thereby increasing overall efficiency by optimising fluid distribution across the impeller area.

SSO2 Bearing

The NF-A14x25 G2 features the further optimised second generation of Noctua’s renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability.

Ultra-tight tip clearance

The NF-A14x25 G2 has a record tight tip clearance (distance between the blade tips and the inside of the frame) of only 0.7mm. This highly ambitious design sets a new benchmark for 140mm fans and helps the NF-A14x25 G2 to work more efficiently against back pressure, such as on heatsinks or radiators, by reducing leak flows through the gap between impeller and frame.

Highly optimised P/Q curve for all applications

The NF-A14x25 G2’s sophisticated aerodynamic design allows for a pressure to airflow (P/Q) curve that is extremely strong in the critical mid-section. This means that the NF-A14x25 G2 is a true jack-of-all-trades with excellent performance in both static pressure and airflow demanding applications.

Specifications	NF-A14x25 G2 LS-PWM
Product Code	NF-A14x25 G2 LS-PWM
Size	140x140x25 mm
Mounting hole spacing	124.5x124.5 mm
Connector & pin-configuration	4-pin PWM
Cable length	20cm + 30cm NA-EC1 extension cable
Bearing	SSO2
Blade geometry	A-Series with Flow Acceleration Channels
Frame technology	AAO (Advanced Acoustic Optimisation)
Material	Sterrox LCP
Rotational speed (±10%)	800 RPM
Rotational speed with L.N.A. (±10%)	600 RPM
Airflow	48.0 CFM
Airflow with L.N.A.	39.7 CFM
Acoustical noise	11.4 dB(A)
Acoustical noise with L.N.A.	8.6 dB(A)
Static pressure	0.71 mm H₂O
Static pressure with L.N.A.	0.43 mm H₂O
Input power (max.)	0.48 W
Max. input current	0.04 A
Operating voltage	12 V
MTTF	150,000 h
Accessories	NA-RC8 Low-Noise Adaptor (L.N.A.), NA-YC1 4-pin PWM splitter cable, NA-EC1 30cm extension cable, 4x NA-AV2 anti-vibration mounts, NA-AVG2-LR anti-vibration gasket, 4x NA-AVP1-LR load-relief anti-vibration pads, Fan screws
Warranty	72 months
EAN barcode	9010018100624

Specifications	NF-A14x25 G2 LS-PWM
Product Code	NF-A14x25 G2 LS-PWM
Size	140x140x25 mm
Mounting hole spacing	124.5x124.5 mm
Connector & pin-configuration	4-pin PWM
Cable length	20cm + 30cm NA-EC1 extension cable
Bearing	SSO2
Blade geometry	A-Series with Flow Acceleration Channels
Frame technology	AAO (Advanced Acoustic Optimisation)
Material	Sterrox LCP
Rotational speed (±10%)	800 RPM
Rotational speed with L.N.A. (±10%)	600 RPM
Airflow	48.0 CFM
Airflow with L.N.A.	39.7 CFM
Acoustical noise	11.4 dB(A)
Acoustical noise with L.N.A.	8.6 dB(A)
Static pressure	0.71 mm H₂O
Static pressure with L.N.A.	0.43 mm H₂O
Input power (max.)	0.48 W
Max. input current	0.04 A
Operating voltage	12 V
MTTF	150,000 h
Accessories	NA-RC8 Low-Noise Adaptor (L.N.A.), NA-YC1 4-pin PWM splitter cable, NA-EC1 30cm extension cable, 4x NA-AV2 anti-vibration mounts, NA-AVG2-LR anti-vibration gasket, 4x NA-AVP1-LR load-relief anti-vibration pads, Fan screws
Warranty	72 months
EAN barcode	9010018100624

Product Resources

Noctua website

FAQ

How do I measure fan size?
The size of fan you need will generally be determined by the size of the fan fitting position in your PC case. The sizes of all the fans on our website are shown as measured along any one of the fan’s four sides, NOT the distance between the fan’s screw holes! Our most popular fan size is 120mm, followed by 80mm. This isn’t really dictated by customer preference, but more by recent designs of PC cases.

As for the thickness (depth) of the fan, generally 25mm (1 inch) is by far the most common depth, although smaller fans can have shallower depths such as 15mm or even 10mm. All our fans are 25mm thick unless otherwise stated. If you have any questions about which fan you should order, please don’t hesitate to get in touch.

If you know the distance between the fan mounting screw holes but don’t know what fan size to order, please see the following table. Note that the mounting hole measurements shown below are taken horizontally or vertically between the holes and not diagonally.

Screw hole spacings and fan sizes

Space Between Screw Holes Fan Size

32mm 40mm

40mm 50mm

50mm 60mm

60mm 70mm

72mm 80mm

83mm 92mm

105mm 120mm
I received a small cable (resistor) with my fan; what is it for?
The resistor cable (also called Ultra Low Noise or ULN cable) is designed to allow the fan to run slightly slower for even quieter operation. The benefit in lower running noise is significant. Although the airflow will be reduced slightly, this usually has minimal effect on PC temperature. We would generally recommend using the ULN resistor cable for best results in almost all circumstances.
How can I tell which way the air blows through the fan?
Hold the fan so that the round fan sticker is facing you. You are looking at the rear of the fan. When you plug the fan in, the air will be blowing towards you. If you want a fan to act as an air intake, then the fan sticker will be facing the inside of the case. Some fans also have two small arrows moulded into their plastic housing - one arrow shows the direction of airflow, and the other (at 90°) shows the direction of blade rotation.
Is it possible to use a 4-pin PWM fan or CPU cooler with a motherboard which has only 3-pin fan headers on it?
Electrically, there is no problem doing this - the fourth pin on the fan cable is used purely for PWM control and is not needed in order for the fan to run. So you can plug the 4-pin fan connector onto the 3-pin motherboard fan header, leaving the fourth pin not connected to anything. The fan will potentially run at full speed, so if you would like to reduce the speed of the fan you will need to adjust the fan speed setting in your BIOS or use fan control software such as SpeedFan in Windows.

The only other problem to consider is that occasionally, components immediately adjacent to the motherboard fan header can get in the way of the larger 4-pin fan connector, physically preventing connection. This problem also occurs if you try to use an in-line fan speed controller such as the one made by Gelid.

Another avenue to explore is the possibility of using a bay-mounted fan controller. Several models are available now which provide 4-pin fan headers, so this is an easy way to use 4-pin PWM fans in a PC system which has only 3-pin fan headers on its motherboards. When using this method, you may find it necessary to disable any fan warning settings in your motherboard BIOS, since the motherboard may incorrectly believe that its CPU fan has failed when the fan is connected to a fan controller rather than directly to the motherboard itself.