The Noctua NF-A4x20 5V PWM is a high-quality 40mm fan designed specifically for 5V systems requiring precise PWM speed control. Featuring Noctua’s advanced aerodynamic technologies—such as Flow Acceleration Channels and the AAO frame—this compact fan delivers exceptional performance in embedded systems, network devices, and other 5V-based environments. With full PWM compatibility, ultra-low noise levels, and included OmniJoin™ adaptor set, it’s a versatile solution for space-constrained thermal challenges.

Key Features:

• Native 5V PWM operation for embedded and USB-powered systems

• Flow Acceleration Channels and AAO frame for superior airflow efficiency

• SSO2 bearing and Smooth Commutation Drive 2 for quiet and long-lasting operation

• Ideal for small form factor (SFF) systems, routers, 3D printers, and IoT devices

• OmniJoin™ adaptor set included for use with proprietary fan headers

Specifications:

• Dimensions: 40 x 40 x 20 mm

• Weight: 50 g

• Rated Voltage: 5V DC

• Voltage Range: 4.5–5.5V

• Rotational Speed: 5000 RPM ±10%

• Airflow: 9.4 m³/h

• Acoustical Noise: 14.9 dB(A)

• Static Pressure: 1.95 mmH₂O

• Connector: 4-pin PWM

• Input Power: 0.4 W

• Input Current: 0.08 A

• Bearing Type: SSO2

• MTBF: >150,000 hours

Compatibility:
Designed for 5V-only operation. Compatible with PWM-enabled embedded boards (e.g. Raspberry Pi), external USB power sources, fan hubs, and network equipment. Do not connect to 12V headers.

Additional Features:

• Includes OmniJoin™ adaptor cables for non-standard connectors

• USB power adaptor cable included

• Low power draw for portable and USB-powered setups

• Anti-vibration mounts and extension cables included

Customer Benefits:
The NF-A4x20 5V PWM offers precise, quiet, and reliable airflow in highly constrained environments where 5V power is standard. Perfect for modders, tinkerers, and professionals working on compact electronics, robotics, or custom fan solutions.

What’s in the Box:

• NF-A4x20 5V PWM fan

• OmniJoin™ adaptor set

• USB power adaptor cable

• 30cm extension cable

• 4x anti-vibration mounts

• 4x fan screws

Compliance:
This product meets all applicable European and international standards (CE, RoHS, REACH, WEEE, etc.). It has been designed and tested for maximum safety, performance, and environmental responsibility.

Manufacturer Contact:
Company Name: Noctua
Address: Noctua Produktions GmbH, Lastenstraße 19, 4020 Linz, Austria
Email: support(at)noctua(dot)at