# Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)

- Category: Case Cooler
- Brand: Noctua
- Model: NF-A4x20 PWM
- Part number: NF-A4x20 PWM
- Price (US): $15.95
- Price last checked: 2026-08-06
- Rating: 4.8/5 from 516 Amazon reviews
- Warranty: 6 years
- Product page: https://buildmypc.net/component-details/case-cooler/noctua-nf-a4x20-pwm/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | Noctua |
| Model | NF-A4x20 PWM |
| FAN RPM | 1200 to 5000 RPM |
| Noise Level | 12.2 to 14.9 dBA |
| Airflow | 4.89 to 5.53 CFM |

## Key Features

- Premium quiet fan, 40x40x20 mm, 12V, 4-pin PWM, max. 5000 RPM, max. 14.9 dB(A), >150,000 h MTTF
- Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
- 40x20mm size ideal for 1U servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
- 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor)
- Includes anti-vibration mounts, fan screws, extension cable, y-cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

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