The Noctua NF-A4x20 FLX is a 40mm premium fan designed to deliver enhanced airflow performance and reduced noise in space-constrained systems. With a thicker 20mm profile and advanced aerodynamic features, it outperforms standard 40x10mm fans in both pressure and efficiency. Featuring 3-pin voltage-based control and bundled speed-reducing adapters, it provides flexible acoustics for embedded, industrial, and home applications.

Key Features:

• 20mm thickness for superior static pressure and airflow
• Advanced Flow Acceleration Channels for optimized aerodynamics
• SSO2 bearing for ultra-quiet, long-lasting operation
• 3-pin FLX model with two speed reducers (L.N.A. and U.L.N.A.)
• OmniJoin™ adapter set for custom 2-pin fan headers

Specifications:

• Dimensions: 40 x 40 x 20 mm
• Weight: ~25 g
• Rotational Speed: 5000 RPM ±10%
• L.N.A. Speed: 4400 RPM
• U.L.N.A. Speed: 3700 RPM
• Airflow: 9.4 m³/h
• Airflow (L.N.A.): 8.3 m³/h
• Airflow (U.L.N.A.): 6.7 m³/h
• Acoustical Noise: 14.9 dB(A)
• Acoustical Noise (L.N.A.): 13.5 dB(A)
• Acoustical Noise (U.L.N.A.): 10.4 dB(A)
• Static Pressure: 2.26 mmH₂O
• Static Pressure (L.N.A.): 1.99 mmH₂O
• Static Pressure (U.L.N.A.): 1.21 mmH₂O
• Voltage: 12V
• Connector: 3-pin
• Bearing Type: SSO2
• MTTF: >150,000 hours

Compatibility:
Perfect for applications such as 1U servers, embedded controllers, network appliances, DVRs, and other tight enclosures needing strong airflow with minimal noise.

Additional Features:

• Includes Low-Noise and Ultra-Low-Noise Adapters
• OmniJoin™ adapter for 2-pin fan headers
• 30cm extension cable included
• Rubber anti-vibration mounts for silent operation

Customer Benefits:
The NF-A4x20 FLX offers an ideal balance of airflow, acoustics, and longevity in tight environments where reliability is critical and space is limited.

What’s in the Box:

• NF-A4x20 FLX fan
• Low-Noise Adapter (L.N.A.)
• Ultra-Low-Noise Adapter (U.L.N.A.)
• OmniJoin™ adapter set
• 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