1. Introduction
The Noctua NF-A9 PWM is a highly optimized, premium quality 92mm quiet fan designed for superior cooling performance in various applications. It features Noctua's AAO (Advanced Acoustic Optimisation) frame and Flow Acceleration Channels, which contribute to its quiet operation and efficient airflow. This PWM version allows for automatic speed control via 4-pin fan headers, offering a broad speed range from 400 to 2000 RPM. A Low-Noise Adaptor (L.N.A.) is included to reduce the maximum speed to 1550 RPM for even quieter operation.
This fan is ideal for 9cm CPU coolers (e.g., Noctua NH-U9(S) & NH-D9L series), compact PC cases (HTPC, ITX, Small Form Factor), and as a replacement fan for NAS devices and other equipment requiring efficient and quiet cooling.
The NF-A9 PWM incorporates Noctua's custom-designed NE-FD1 IC for precise automatic speed control and utilizes a reference-class SSO2 bearing for superb running smoothness and long-term stability.
2. Package Contents
Please verify that all items listed below are present in your package:
- Noctua NF-A9 PWM 92mm Fan
- Low-Noise Adaptor (L.N.A.)
- 4x Anti-Vibration Mounts
- 4x Fan Screws
- Extension Cable
- Y-Cable (for running two PWM fans on the same header)
3. Setup and Installation
Follow these steps to properly install your Noctua NF-A9 PWM fan:
- Prepare Mounting Location: Identify the desired mounting location for the fan (e.g., CPU cooler, PC case, NAS enclosure). Ensure there is sufficient space and proper airflow direction.
- Choose Mounting Method: You can use either the provided anti-vibration mounts or standard fan screws. The anti-vibration mounts help reduce noise transfer to the chassis.
- Anti-Vibration Mounts: Push the mounts through the fan's mounting holes and then through the corresponding holes on your case or cooler. Gently pull the mounts until they are securely seated.
- Fan Screws: Use the four provided fan screws to secure the fan to the mounting surface. Do not overtighten.
- Connect the Fan: The NF-A9 PWM fan features a 4-pin connector. Connect this connector to an available 4-pin PWM fan header on your motherboard or fan controller. Ensure the connector is fully seated.
Close-up of the 4-pin PWM connector. - Optional: Use Low-Noise Adaptor (L.N.A.): If you desire even quieter operation, connect the Low-Noise Adaptor (L.N.A.) between the fan and the 4-pin PWM header. This adaptor reduces the maximum fan speed from 2000 RPM to 1550 RPM.
- Optional: Use Y-Cable: If you are installing two NF-A9 PWM fans and wish to control them from a single motherboard header, use the provided Y-cable. Connect both fans to the Y-cable, then connect the Y-cable to the motherboard's 4-pin PWM header.
- Configure BIOS/UEFI: Access your system's BIOS/UEFI settings to ensure the fan header is configured for PWM control (if applicable) and to set desired fan curves for automatic speed adjustment based on temperature. Refer to your motherboard manual for specific instructions.
4. Operating Instructions
Once installed and connected, the Noctua NF-A9 PWM fan operates automatically based on the PWM signal from your motherboard or fan controller. The fan's speed will adjust dynamically to provide optimal cooling while minimizing noise.
- Automatic Speed Control: The 4-pin PWM connection allows your system to precisely control the fan speed, ranging from 400 RPM (minimum) to 2000 RPM (maximum).
- Low-Noise Operation: With the Low-Noise Adaptor (L.N.A.) connected, the maximum speed is capped at 1550 RPM, further reducing noise levels for users prioritizing silence.
- Flow Acceleration Channels: The fan blades feature Flow Acceleration Channels, which accelerate airflow at the outer regions of the blades, leading to improved efficiency and lower noise emissions.
Close-up of fan blades with Flow Acceleration Channels.
5. Maintenance
Regular maintenance ensures optimal performance and longevity of your fan.
- Cleaning: Periodically clean the fan blades and frame to remove dust buildup. Use a soft brush, compressed air, or a damp cloth. Ensure the fan is powered off and disconnected before cleaning.
- Inspection: Check for any obstructions around the fan that might impede airflow. Ensure cables are routed away from the fan blades.
- Bearing: The SSO2 bearing is self-stabilizing and requires no lubrication or maintenance throughout its lifespan.
6. Troubleshooting
If you encounter issues with your NF-A9 PWM fan, refer to the following common troubleshooting steps:
- Fan Not Spinning:
- Ensure the 4-pin connector is securely plugged into the motherboard or fan controller.
- Check your system's BIOS/UEFI settings to confirm the fan header is enabled and configured for PWM control.
- Verify that the system is receiving power.
- If using a fan controller, ensure it is powered and functioning correctly.
- Fan Too Loud:
- Ensure the fan is securely mounted using either the anti-vibration mounts or screws to prevent rattling.
- Connect the Low-Noise Adaptor (L.N.A.) to reduce the maximum fan speed.
- Adjust the fan curve in your BIOS/UEFI settings to lower speeds at idle or low temperatures.
- Check for any obstructions or loose cables that might be hitting the fan blades.
- Insufficient Cooling Performance:
- Verify the fan's airflow direction is correct for your application (typically blowing towards the component to be cooled or exhausting hot air).
- Ensure there are no obstructions blocking the fan's intake or exhaust.
- Check your BIOS/UEFI settings to ensure the fan speed is increasing adequately with temperature.
- Clean any dust buildup on the fan or heatsink fins.
7. Specifications
| Model | NF-A9 PWM |
| Dimensions | 92x92x25 mm (3.62"L x 0.98"W x 3.62"H) |
| Bearing Type | SSO2 |
| Rotational Speed (Max) | 2000 RPM |
| Rotational Speed with L.N.A. (Max) | 1550 RPM |
| Min. Rotational Speed (PWM) | 400 RPM |
| Noise Level (Max) | 22.8 dB(A) |
| Voltage | 12 V |
| Power Connector | 4-Pin PWM |
| MTTF (Mean Time To Failure) | >150,000 h |
| Material | Fibre-glass reinforced PBT |
| Item Weight | 8 ounces |
8. Warranty and Support
Noctua products are known for their quality and reliability. The NF-A9 PWM fan comes with a 6-year manufacturer's warranty, ensuring peace of mind for your investment.
For technical support, warranty claims, or further information, please visit the official Noctua website or contact their customer service department.
Thank you for choosing Noctua.
