Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 5V PWM is a PWM enabled 5V variant of Noctua’s highly optimised, premium quality quiet 40x20mm fan. The custom designed NE-FD3 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings assure superb running smoothness and excellent long-term stability. Topped off with modular cabling and the OmniJoin Adaptor Set, the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that require PWM control.
5V PWM version
Many devices such as network or storage solutions use 5 volt 40mm fans with PWM speed control. With the same operating voltage, PWM support and the included OmniJoin adaptor set that makes it compatible with proprietary fan headers, the NF-A4x20 5V PWM is ideal for replacing noisy or broken 5V 40mm fans with PWM.
Please Note: Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
Flow Acceleration Channels
The NF-A4x20 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.
SSO2 Bearing
The NF-A4x20 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.
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.
Scope of delivery
- NA-YC1 4-pin PWM y-cable
- NA-EC1 30cm extension cable
- OmniJoin adaptor set
- 4x NA-AV3 anti-vibration mounts
- Fan screws
Please Note:
Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
 NF-A4x20 PWM |  NF-A4x20 FLX |  NF-A4x20 5V PWM |  NF-A4x20 5V | |
|---|---|---|---|---|
| Customer Reviews | — | — | — | — |
| Price | — | — | — | — |
| Connector | 4-pin PWM | 3-pin | 4-pin PWM | 3-pin |
| Voltage | 12V | 12V | 5V | 5V |
| RPM | Max: 5000 / Min: 1200 | 5000 | Max: 5000 / Min: 1100 | 5000 |
| RPM with L.N.A. | 4400 | 4400 | - no data | - no data |
| RPM with U.L.N.A. | - no data | 3700 | - no data | - no data |
| Acoustical Noise | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) |
| Acoustical Noise with L.N.A. | 12,2 dB(A) | 12,2 dB(A) | - no data | - no data |
| Acoustical Noise with U.L.N.A. | - no data | 8,5 dB(A) | - no data | - no data |
| Size | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm |
| Colour | Brown & Beige | Brown & Beige | Brown & Beige | Brown & Beige |
Noctua Cooling Solutions
Noctua's premium cooling components are internationally renowned for their superb quietness, exceptional performance and quality.
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 5V PWM is a PWM enabled 5V variant of Noctua’s highly optimised, premium quality quiet 40x20mm fan. The custom designed NE-FD3 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings assure superb running smoothness and excellent long-term stability. Topped off with modular cabling and the OmniJoin Adaptor Set, the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that require PWM control.
5V PWM version
Many devices such as network or storage solutions use 5 volt 40mm fans with PWM speed control. With the same operating voltage, PWM support and the included OmniJoin adaptor set that makes it compatible with proprietary fan headers, the NF-A4x20 5V PWM is ideal for replacing noisy or broken 5V 40mm fans with PWM.
Please Note: Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
Flow Acceleration Channels
The NF-A4x20 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.
SSO2 Bearing
The NF-A4x20 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.
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.
Scope of delivery
- NA-YC1 4-pin PWM y-cable
- NA-EC1 30cm extension cable
- OmniJoin adaptor set
- 4x NA-AV3 anti-vibration mounts
- Fan screws
Please Note:
Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
NF-A4x20 PWM | NF-A4x20 FLX | NF-A4x20 5V PWM | NF-A4x20 5V | |
|---|---|---|---|---|
| Customer Reviews | — | — | — | — |
| Price | — | — | — | — |
| Connector | 4-pin PWM | 3-pin | 4-pin PWM | 3-pin |
| Voltage | 12V | 12V | 5V | 5V |
| RPM | Max: 5000 / Min: 1200 | 5000 | Max: 5000 / Min: 1100 | 5000 |
| RPM with L.N.A. | 4400 | 4400 | - no data | - no data |
| RPM with U.L.N.A. | - no data | 3700 | - no data | - no data |
| Acoustical Noise | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) |
| Acoustical Noise with L.N.A. | 12,2 dB(A) | 12,2 dB(A) | - no data | - no data |
| Acoustical Noise with U.L.N.A. | - no data | 8,5 dB(A) | - no data | - no data |
| Size | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm |
| Colour | Brown & Beige | Brown & Beige | Brown & Beige | Brown & Beige |
Noctua Cooling Solutions
Noctua's premium cooling components are internationally renowned for their superb quietness, exceptional performance and quality.
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