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Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A6x25 is a highly optimised, premium quality quiet fan in 60x25mm size. The PWM version sports Noctua’s custom designed NE-FD1 IC for fully automatic speed control via 4-pin fan headers and comes with a Low-Noise-Adaptor to reduce the maximum speed during PWM control from 3000 to 2300rpm. Its superb running smoothness, SSO2 bearing and Noctua’s trusted premium quality make it an elite choice for the highest demands.
Details
Flow Acceleration Channels

Flow Acceleration Channels

The NF-A6x25 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.
Reduced Motor Hub Size

Reduced Motor Hub Size

Thanks to its streamlined, compact motor design, the NF-A6x25's motor hub is smaller than with conventional 6cm fans. This allows for more blade surface area and thus contributes to the NF-A6x25's superior airflow and pressure performance.
AAO Frame

AAO Frame

Noctua's AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua's proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan's performance/noise efficiency.
Inner Surface Microstructures

Inner Surface Microstructures

With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.
Stepped Inlet Design

Stepped Inlet Design

Noctua's Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space-restricted environments.
Integrated Anti-Vibration Pads

Integrated Anti-Vibration Pads

Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.
SSO2 Bearing

SSO2 Bearing

The NF-A6x25 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.
Custom-designed PWM IC with SCD

Custom-designed PWM IC with SCD

Supporting fully automatic PWM speed control, the NF-A6x25 PWM uses Noctua's custom-designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology. By providing smoother torque impulses, SCD suppresses PWM switching noises and thus makes the fan quieter at low speeds.
Low-Noise Adaptor

Low-Noise Adaptor

The NF-A6x25 PWM is supplied with a (L.N.A.) that reduces the maximum fan speed from 3000 to 2300rpm. The L.N.A. can be used either to run the fan at a fixed speed of 2300rpm or to cap the maximum speed when using automatic PWM control.
Extensive cabling options

Extensive cabling options

The fan's short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved and a 4-pin y-cable allows the connection of a second NF-A6x25 PWM fan to the same PWM fan header for automatic control.
6-year manufacturer’s warranty

6-year manufacturer’s warranty

Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A6x25 features an MTBF of more than 150.000 hours rating and comes with a full 6-year manufacturer’s warranty.
NF-A6x25 PWM
FAN Specification
Size
60x60x25 mm
Mounting hole spacing
50x50 mounting_hole_spacing
Connector
4-Pin PWM
Bearing
Blade Geometry
A-Series with Flow Acceleration Channels blade_geometry
Rotational Speed (+/- 10%)
3000 RPM
Rotational Speed with L.N.A. (+/- 10%)
2300 RPM
Min. Rotational Speed (PWM, +/-20%)
550 min_rotational_speed_pw
Acoustical Noise
19,3 dB(A)
Static Pressure
2,18 mm H₂O
Static Pressure with L.N.A.
1,29 mm H₂O
Max. Input Power
0,96 W
Max. Input Current
0,08 A
Voltage
12 V
MTTF
> 150.000 h
Scope of Delivery
  • Low-Noise Adaptor (L.N.A.)
  • 4-Pin Y-Cable
  • 30cm Extension Cable
  • 4 Vibration-Compensators
  • 4 Fan Screws
Warranty
6 years
NF-A6x25 PWM
NF-A6x25 PWM Video
08.11.2015 // AndroidPC.es
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NF-A6x25 PWM Review

Después de probar los modelos NF-A6x25 PWM, NF-A6x25 FLX, NF-A4x10 FLX y NF-A4x10 5V nos dan ganas de dejar un ventilador en nuestras placas pasivas, pero preferimos no hacerlo, como ya sabéis nos gustan los sistemas pasivos. Ciertamente es estos productos pueden ofrecen una mejora térmica en nuestros dispositivos si vamos a exprimirlos y además no nos molestan con ruidos. Si tenemos algún modelo pasivo con problemas térmicos añadirle un pequeño ventilador bien dimensionado siempre es una solución, sobretodo si tienen la calidad de estos modelos.
Test verdict: "Los recomendamos sin ninguna duda para quien quiera mejorar el rendimiento de su miniPC o AndroidPC con problemas térmicos." (Joaquin Prida Trujillo, AndroidPC.es)
15.04.2015 // ByTheWay.gr
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NF-A6x25 PWM Review

Κλείνοντας,οι επιδόσεις του νέου NF-A6x25 PWM είναι εξαιρετικές. Καταφέρνει να έχει σπουδαίες επιδόσεις και εξαιρετικά επίπεδα θορύβου με τον low noise adapter που προσφέρει η εταιρία. Set it and forget it προσέγγιση και μπορούμε να εγγυηθούμε το "forget it" κομμάτι. Η επιμονή στην λεπτομέρεια της Noctua είναι προφανής. Μερικές από τις αναφερόμενες τεχνολογίες θυμίζουν μελέτες αεροδυναμιστών παρά κατασκευαστών computer parts και η παρεχόμενη εγγύηση των 6 ετών είναι χωρίς προηγούμενο σε μια αγορά που η 3ετής πλέον θεωρείται πολυτέλεια. Σκεφτείτε το, το 2020 οι ανεμιστήρες σας θα είναι ακόμα εντός εγγύησης και μάλιστα από μια εταιρία που συνηθίζει να την τιμά, χωρίς αστείες δικαιολογίες.
Test verdict: "Η Noctua δείχνει ότι δεν αγχώνεται να διώξει το premium χαρακτήρα της ούτε από την τιμολογιακή της πολιτική, και ειλικρινά δεν περιμέναμε κάτι διαφορετικό εκεί. Όμως, αυτό που έχουμε να παρατηρήσουμε είναι η κορυφαία ποιότητα κατασκευής σε συνδυασμό με τον εξαιρετικό σχεδιασμό που επιφέρουν καλύτερες επιδόσεις, ενώ ταυτόχρονα μπορούν και προσφέρουν ήσυχη και απρόσκοπτη λειτουργία ακόμα και σε πολύωρη χρήση." (Nasioulis Evangelos, ByTheWay.gr)

Installation Manual (PDF)

Information Sheet (PDF)

Can I run 4-pin PWM fans on 3-pin fan headers?

PWM fans come with a 4-pin connectors for fully automatic speed control via your mainboard’s 4-pin PWM fan headers. Please note that 4-pin fans can also be connected to your mainboard’s 3-pin fan headers though. When connected to 3-pin fan headers, the fan will run at full speed (unless the mainboard supports voltage based speed control).

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