The Noctua NF-A4x20 PWM is a premium-grade 40mm fan designed for compact systems and demanding airflow scenarios where space is severely limited. With a depth of just 20mm and PWM support for fully automatic speed control, it is ideal for high-density builds, networking hardware, 3D printers, NAS enclosures, and industrial or embedded systems requiring efficient, silent airflow.

Key Features:

40x20mm form factor with high airflow and pressure-to-size ratio

PWM control (4-pin) for dynamic fan speed and quiet ramping

SSO2 bearing for extreme longevity and ultra-low vibration

Advanced aerodynamic design with Flow Acceleration Channels and AAO frame

Trusted for 24/7 operation in mission-critical or thermally-constrained environments

Specifications:

• Dimensions: 40 x 40 x 20 mm

• Weight: 45 g

• Bearing Type: SSO2 (Self-Stabilizing Oil-Pressure Bearing)

• Fan Speed: 1200–5000 RPM ±10%

• Airflow: up to 9.4 m³/h

• Static Pressure: 2.26 mm H₂O

• Acoustics: max. 14.9 dB(A)

• Connector: 4-pin PWM

• Voltage Range: 5–13.2V

• Max Power Draw: 0.6 W

• MTBF: >150,000 hours

Additional Features:

• Ultra-slim depth (20mm) for space-constrained enclosures

• Includes Low-Noise Adapter (L.N.A.) for quiet profiles

• 24V-to-12V step-down compatibility for embedded and lab use

• Optional anti-vibration mounts and fan grills available separately

Customer Benefits:
Compact but powerful, the NF-A4x20 PWM brings Noctua’s renowned engineering to miniature systems. Its silent operation, robust bearings, and intelligent speed control make it a top choice for users who demand both performance and durability in limited-space environments.

What’s in the Box:

• NF-A4x20 PWM 40mm fan

• Low-Noise Adapter (L.N.A.)

• 4 × fan screws

• NA-EC1 30cm extension cable

• NA-YC1 PWM Y-splitter cable

Compliance:
This product meets CE, RoHS, REACH, and WEEE directives. Engineered and manufactured in Austria to meet strict reliability and environmental standards, ideal for professional and industrial applications.

Manufacturer Contact:
Company Name: Noctua GmbH
Address: Josef-Preis-Allee 18, 8020 Graz, Austria
Email: support(at)noctua(dot)at