Introduction
Thank you for choosing a Noctua NF-A4x20 series fan. Noctua is committed to providing superior quiet cooling performance through advanced aerodynamic design and meticulous engineering. Our fans are thoroughly optimized to deliver exceptional performance and quiet operation.
Each Noctua fan undergoes rigorous quality control to ensure flawless operation. We are confident that you will appreciate the research, attention, and care invested in this product.
Package Contents
The contents of your NF-A4x20 fan package may vary slightly depending on the specific model (PWM, FLX, 5V, 24V). Typically, it includes:
- Noctua NF-A4x20 fan
- NA-AV3 anti-vibration mounts
- Fan screws
- OmniJoin™ adaptor set
- Extension cable (30cm, NA-EC1 or NA-EC2)
- Low-Noise Adaptor (L.N.A.) (NA-RC8 for PWM, NA-RC11 for FLX)
- 4-pin PWM splitter cable (NA-YC1, for PWM models)
- USB power adaptor cable (NA-AC7, for 5V PWM models)
- 3:2-pin adaptor (NA-AC2, for 5V and FLX models)
- 2-pin JST XHP-2 2.5mm adaptor (NA-AC9, for 24V PWM models)
Installation
When replacing an existing 40mm fan, it is generally recommended to use the original screws or mounting mechanism from the device.
Installing as a Case Fan with NA-AV3 Anti-Vibration Mounts
- Pull the 'F' side of the NA-AV3 mount through the fan's mounting holes until pawl 2 is fully through the hole.
- Caution: Only pull pawl 2 through the first hole. Do not overstretch the mounts by pulling further pawls through!
- Pull the 'C' side through the mounting holes of the case. If the long ends of the mounts interfere, they can be cut with scissors after installation. Note that cutting them will make future reinstallation difficult.
Connection
The NF-A4x20 series fans come in various versions (PWM, FLX, 5V, 24V) with different connectors and voltage requirements. Please identify your specific fan model before connecting.
NF-A4x20 PWM (12V)
- Features a 4-pin PWM connector for automatic speed control via your motherboard's 4-pin PWM fan headers.
- Can be connected to standard 3-pin fan headers, but will run at full speed unless the motherboard supports voltage-based speed control.
- For multiple PWM fans, use the supplied 4-pin y-cable (NA-YC1) to connect them to one PWM fan header.
- A 30cm extension cable (NA-EC1) is included for longer cable runs.
- The Low-Noise Adaptor (NA-RC8) can reduce fan speed from 5000 to 3700rpm for quieter operation.
NF-A4x20 5V PWM
- Features a 4-pin PWM connector for PWM-based speed control.
- Can be connected to standard 3-pin fan headers, but will run at full speed.
- Caution: Being a 5V fan, it cannot be run at 12V and will be damaged if connected to typical 12V power sources (e.g., PC mainboard fan headers).
- Use the included NA-AC7 USB power adaptor cable for USB power sources. This cable must be used exclusively with the NF-A4x20 5V PWM to avoid damaging sensitive USB host devices.
- A 30cm extension cable (NA-EC1) is included for longer cable runs.
- The Low-Noise Adaptor (NA-RC8) can reduce fan speed from 5000 to 3700rpm for quieter operation.
NF-A4x20 FLX (12V) & NF-A4x20 5V
- Features a standard 3-pin fan connector.
- Can be connected to 4-pin mainboard fan headers.
- For 2-pin fan headers, use the supplied 3:2-pin adaptor (NA-AC2). If it doesn't fit, use the OmniJoin adaptor set.
- Integrated polarity protection prevents damage from reversed polarity, but the fan will not operate if connected incorrectly.
- A 30cm extension cable (NA-EC2) is included for longer cable runs.
- For FLX models, the Low-Noise Adaptor (NA-RC11) can reduce fan speed from 4500 to 3700rpm.
NF-A4x20 24V PWM
- Features a 4-pin PWM connector for PWM-based speed control.
- Can be connected to standard 3-pin fan headers, but will run at full speed.
- Caution: Being a 24V fan, it cannot be run at 12V and requires a starting voltage of at least 17V. It is not suitable for standard PC applications.
- The included NA-AC9 adaptor cable allows connection to 2-pin JST XHP-2 2.5mm sockets found on many 3D printer models.
- A 30cm extension cable (NA-EC1) is included for longer cable runs.
- The Low-Noise Adaptor (NA-RC8) can reduce fan speed from 5000 to 4100rpm.
Using the OmniJoin™ Adaptor Set (for proprietary fan headers)
The OmniJoin™ adaptor set allows connection to proprietary fan headers. This is useful when replacing fans in devices like network or storage solutions.
- Identify the individual leads of the OmniJoin adaptor (black for Ground, red for +Voltage) and the original fan's cable. Match the black adaptor lead with the original GND lead, and the red adaptor cable with the original +Voltage lead (+5V, +12V, or +24V depending on your fan model). Refer to your device's manual if unsure.
- Cut off the connector of the original fan, leaving at least 2-3 cm of cable.
- Take a supplied cable connector and insert the GND lead of the original cable and the black lead of the OmniJoin adaptor into the two holes. Ensure both leads are fully inserted.
- Use flat nose pliers to push down the yellow button of the cable connector until it's fully depressed.
- Repeat steps 3 and 4 for the +Voltage lead.
- Once the original fan's cable is fixed to the OmniJoin adaptor, connect your NF-A4x20 fan to the adaptor.
Operating
Noctua NF-A4x20 series fans are designed for continuous, reliable operation. Ensure proper connection to the correct voltage source as detailed in the "Connection" section.
- PWM Models: Offer automatic speed control when connected to a compatible 4-pin PWM header on your motherboard or device. This allows for dynamic adjustment of fan speed based on temperature, optimizing for both cooling performance and noise levels.
- FLX/5V Models: Operate at a fixed speed. The included Low-Noise Adaptors can be used to reduce the fan's maximum speed for quieter operation if desired.
- Voltage Compatibility: Always ensure the fan's voltage (5V, 12V, or 24V) matches the power source to prevent damage.
Maintenance
To ensure optimal performance and longevity of your Noctua fan, regular maintenance is recommended:
- Cleaning: Periodically clean your fan using a duster, a slightly moist tissue, or canned air to remove dust buildup.
- Caution: Avoid applying excessive force during cleaning to prevent damage to the fan blades or housing. Do not use a vacuum cleaner, as this can exert too much force.
- Bearing: The premium grade SSO2 bearing is fully sealed to prevent the ingress of fine dust particles, ensuring flawless operation over many years.
- Disassembly: The fan is not designed to be disassembled by the user. Removing the impeller from the frame will break the bearing's seal and void the warranty.
Troubleshooting
- Fan Not Spinning:
- Ensure the fan is correctly connected to a power source with the appropriate voltage.
- For 2-pin connections, verify correct polarity.
- Check if the power source is active and providing sufficient power.
- Fan Damaged:
- A 5V fan connected to a 12V power source will be damaged.
- A 24V fan connected to a 12V power source is not suitable and may not operate or could be damaged.
- Excessive Noise:
- Ensure the fan is securely mounted and not vibrating against other components.
- Check for any obstructions in the fan's path.
- Consider using the included Low-Noise Adaptor (L.N.A.) to reduce fan speed and noise.
For further assistance, please consult the regularly updated FAQs on the Noctua website: http://www.noctua.at/faqs. You may also contact our support team at support@noctua.at.
Specifications
The Noctua NF-A4x20 series offers various models. Below are the general specifications, with specific details for each variant where applicable.
| Feature | NF-A4x20 PWM (12V) | NF-A4x20 5V PWM | NF-A4x20 FLX (12V) | NF-A4x20 5V | NF-A4x20 24V PWM |
|---|---|---|---|---|---|
| Size | 40x40x20 mm | ||||
| Mounting hole spacing | 32x32 mm | ||||
| Connector & pin-configuration | 4-pin PWM | 4-pin PWM | 3-pin | 3-pin | 4-pin PWM |
| Cable length | 20cm + 30cm NA-EC1/NA-EC2 extension cable | ||||
| Bearing | SSO2 | ||||
| Blade geometry | A-Series with Flow Acceleration Channels | ||||
| Frame technology | AAO (Advanced Acoustic Optimisation) | ||||
| Rotational speed (+/- 10%) | 5000 RPM | 5000 RPM | 4500 RPM | 5000 RPM | 5000 RPM |
| Rotational speed with L.N.A. (+/- 10%) | 4400 RPM | 4400 RPM | 3700 RPM | 3700 RPM | 4100 RPM |
| Min. rotational speed @ 20% PWM (+/-20%) | 1200 RPM | 1200 RPM | N/A | N/A | 1200 RPM |
| Airflow | 9.4 m³/h | 9.4 m³/h | 9.4 m³/h | 9.4 m³/h | 9.4 m³/h |
| Airflow with L.N.A. | 8.3 m³/h | 8.3 m³/h | 6.9 m³/h | 6.9 m³/h | 8.3 m³/h |
| Acoustical noise | 14.9 dB(A) | 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) | 8.5 dB(A) | 8.5 dB(A) | 12.2 dB(A) |
| Static pressure | 2.26 mm H₂O | 2.26 mm H₂O | 2.26 mm H₂O | 2.26 mm H₂O | 2.26 mm H₂O |
| Static pressure with L.N.A. | 1.75 mm H₂O | 1.75 mm H₂O | 1.23 mm H₂O | 1.23 mm H₂O | 1.75 mm H₂O |
| Max. input power | 0.6 W | 0.5 W | 0.6 W | 0.5 W | 0.6 W |
| Max. input current | 0.05 A | 0.1 A | 0.05 A | 0.1 A | 0.05 A |
| Operating voltage | 12 V | 5 V | 12 V | 5 V | 24 V |
| Voltage PWM signal | 5 V | 5 V | N/A | N/A | 5 V |
| MTTF | > 150.000 h | ||||
| Warranty | 6 years | ||||
User Tips
- This fan is an excellent replacement for noisy stock fans in network equipment like switches, providing significantly quieter operation.
- When replacing fans in specialized equipment, always double-check the voltage requirements of the original fan and the device to ensure compatibility with your Noctua NF-A4x20 model.
- The included OmniJoin adaptor set is highly versatile for connecting to non-standard fan headers found in various devices.
Warranty and Support
Noctua provides a 6-year manufacturer's warranty for the NF-A4x20 series fans. In the unlikely event of a defect, we offer direct, fast, and straightforward RMA service.
Should you encounter any problems or have further questions, please do not hesitate to contact our support team:
- Email: support@noctua.at
- FAQs: http://www.noctua.at/faqs
- Multilingual Manuals: http://www.noctua.at/manuals
For additional information and resources, please visit the official Noctua website.