1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Noctua NF-A20 PWM premium quiet fan. Please read this manual thoroughly before installation to ensure proper function and longevity of the product.
The Noctua NF-A20 is a high-performance 200mm fan designed for quiet operation and efficient cooling. It features an AAO (Advanced Acoustic Optimisation) frame and Flow Acceleration Channels for superior airflow and reduced noise levels. The PWM version includes a custom NE-FD1 IC for automatic speed control.
2. Package Contents
Verify that all items listed below are present in your package:
- 1x Noctua NF-A20 PWM Fan
- 4x Anti-Vibration Mounts
- 4x Fan Screws
- 1x Low-Noise Adaptor (L.N.A.)
- 1x 30cm Extension Cable
- 1x 4-pin Y-Cable (for connecting two PWM fans to one header)
3. Setup and Installation
Before installation, ensure your computer case has sufficient space and compatible mounting holes for a 200x30mm fan. The NF-A20 PWM fan is 200mm in diameter and 30mm thick.
3.1. Case Compatibility
The NF-A20 PWM features three sets of mounting holes for versatility:
- 154x154mm spacing
- 170x170mm spacing
- 110x180mm spacing
Verify your chassis mounting points match one of these configurations.
3.2. Mounting the Fan
- Determine Airflow Direction: Identify the desired airflow direction. The fan typically has an arrow on its side indicating the direction of airflow and blade rotation.
- Choose Mounting Hardware: Select either the provided anti-vibration mounts or standard fan screws. Anti-vibration mounts reduce noise transfer to the case.
- Secure the Fan: Position the fan in the desired location within your PC case. Use the chosen hardware to firmly attach the fan to the case. Do not overtighten screws if using them.
3.3. Connecting the Fan
- Locate a 4-pin Fan Header: Find an available 4-pin PWM fan header on your motherboard. These are typically labeled 'CPU_FAN', 'SYS_FAN', or similar.
- Connect the Fan Cable: Plug the fan's 4-pin connector into the motherboard header. Ensure the connector is oriented correctly.
- Optional: Use Extension Cable: If the fan cable is too short, use the included 30cm extension cable.
- Optional: Use Y-Cable: To connect two PWM fans to a single motherboard header, use the included 4-pin Y-cable. This allows both fans to be controlled simultaneously.
- Optional: Use Low-Noise Adaptor (L.N.A.): For further noise reduction, connect the L.N.A. between the fan and the motherboard header. This adaptor reduces the maximum fan speed, resulting in quieter operation at the expense of some airflow.
4. Operating the Fan
The Noctua NF-A20 PWM fan is designed for automatic speed control via its 4-pin PWM connection. This allows your motherboard to adjust the fan speed based on system temperature, optimizing the balance between cooling performance and noise levels.
4.1. Automatic Speed Control (PWM)
Once connected to a 4-pin PWM header, the fan speed will be automatically regulated by your motherboard's BIOS/UEFI settings or operating system software. You can typically configure fan curves in your motherboard's settings to define how fan speed responds to temperature changes.
4.2. Low-Noise Adaptor (L.N.A.)
If you desire an even quieter operation, even at maximum load, you can use the included Low-Noise Adaptor. This adaptor reduces the maximum rotational speed of the fan, thereby lowering its noise output. Note that using the L.N.A. will also reduce the fan's maximum airflow and static pressure.
5. Maintenance
The Noctua NF-A20 PWM fan is built with a high-quality SSO2 bearing, designed for long-term reliability and smooth operation. Minimal maintenance is required.
5.1. Cleaning
Periodically inspect the fan blades and frame for dust accumulation. Dust can impede airflow and increase noise. To clean:
- Power off your computer and disconnect the fan.
- Use compressed air or a soft brush to gently remove dust from the fan blades and frame.
- Avoid using liquids or harsh chemicals.
5.2. Bearing System
The SSO2 bearing system is self-stabilizing and does not require lubrication or additional maintenance throughout its lifespan, which is rated at over 150,000 hours MTTF (Mean Time To Failure).
6. Troubleshooting
If you encounter issues with your Noctua NF-A20 PWM fan, refer to the following common troubleshooting steps:
6.1. Fan Not Spinning
- Check Connections: Ensure the 4-pin connector is securely plugged into the motherboard fan header.
- Power Supply: Verify that your power supply is functioning correctly and providing power to the motherboard.
- BIOS/UEFI Settings: Check your motherboard's BIOS/UEFI settings to ensure the fan header is enabled and configured correctly. Some motherboards may have fan headers disabled by default or set to a very low RPM threshold.
- Test with Another Header: If possible, try connecting the fan to a different 4-pin fan header on the motherboard to rule out a faulty header.
6.2. Fan is Too Loud
- PWM Settings: Adjust the fan curve in your motherboard's BIOS/UEFI settings to reduce the fan speed at lower temperatures.
- Low-Noise Adaptor (L.N.A.): Install the included L.N.A. to reduce the fan's maximum speed and noise output.
- Mounting: Ensure the fan is securely mounted and not vibrating against the case. Use the anti-vibration mounts if not already installed.
- Obstructions: Check for any cables or objects obstructing the fan blades.
6.3. Insufficient Cooling Performance
- Airflow Direction: Confirm the fan is oriented to push air in the correct direction for your case's cooling setup (e.g., intake or exhaust).
- Dust Accumulation: Clean any dust from the fan blades and surrounding areas.
- PWM Settings: Increase the fan speed in your motherboard's BIOS/UEFI settings, especially at higher temperatures.
- Remove L.N.A.: If the Low-Noise Adaptor is installed, remove it to allow the fan to operate at its full speed range.
7. Specifications
| Feature | Specification |
|---|---|
| Model | NF-A20 PWM |
| Dimensions | 200 x 200 x 30 mm (7.87"L x 7.87"W x 1.18"H) |
| Connector Type | 4-Pin PWM |
| Bearing Type | SSO2 |
| Voltage | 12 V |
| Max. Rotational Speed | 800 RPM |
| Max. Rotational Speed with L.N.A. | 550 RPM |
| Max. Airflow | 146.9 m³/h |
| Max. Airflow with L.N.A. | 100.1 m³/h |
| Max. Acoustical Noise | 18.1 dB(A) |
| Max. Acoustical Noise with L.N.A. | 10.8 dB(A) |
| MTTF | >150,000 h |
| Material | Fibre-glass reinforced PBT |
| Weight | 1.55 pounds |
8. Warranty and Support
Noctua products are known for their quality and reliability. The NF-A20 PWM fan features a highly reliable SSO2 bearing with an MTTF (Mean Time To Failure) exceeding 150,000 hours, indicating exceptional longevity.
For further assistance, technical support, or warranty claims, please visit the official Noctua website or contact their customer service. Information regarding spare part availability is typically provided for a duration of 6 years in the EU.
For more information, visit the Noctua Store on Amazon.
9. Additional Information
The NF-A20 PWM fan incorporates advanced aerodynamic design features such as Flow Acceleration Channels, which are small ridges on the suction side of the blades. These channels speed up the airflow in critical outer regions, reducing flow separation and improving efficiency and acoustic performance.
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