---
product_id: 47568525
title: "Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)"
brand: "noctua"
price: "€ 36.80"
currency: EUR
in_stock: true
category: "Noctua"
url: https://www.desertcart.pt/products/47568525-noctua-nf-a4x20-flx-computer-case-fan-cooling-components-computer
store_origin: PT
region: Portugal
---

# Up to 5000 RPM speed control Ultra-quiet max 14.9 dB(A) noise Includes anti-vibration mounts & adaptors Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)

**Brand:** noctua
**Price:** € 36.80
**Availability:** ✅ In Stock

## Summary

> 🌀 Silence meets power: The fan your setup deserves

## Quick Answers

- **What is this?** Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) by noctua
- **How much does it cost?** € 36.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/47568525-noctua-nf-a4x20-flx-computer-case-fan-cooling-components-computer)

## Best For

- noctua enthusiasts

## Why This Product

- Trusted noctua brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact powerhouse:** 40x40x20mm size ideal for tight 1U spaces & network gear
- • **Tailored speed control:** 3-step FLX settings for perfect balance of airflow & quiet
- • **Plug & play versatility:** OmniJoin adaptor set & extension cable for seamless installation
- • **Vibration-free operation:** Integrated silicone anti-vibration pads for whisper-quiet stability
- • **Precision airflow mastery:** Flow Acceleration Channels boost efficiency & silence

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20mm computer case fan engineered for ultra-quiet, high-performance cooling. Featuring advanced Flow Acceleration Channels and a second-generation SSO2 bearing, it delivers up to 5000 RPM with minimal noise (max 14.9 dB(A)). Designed for compact 1U applications and network/storage devices, it includes anti-vibration mounts, multiple speed adaptors, and versatile connectors for effortless installation and tailored airflow control.

## Description

Buy Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM): Case Fans - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- Premium quiet fan, 40x40x20 mm, 12V, 3-pin Molex, 5000/4400/370 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 applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
- 3-pin FLX version provides 5000/4400/3700rpm speed settings via Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
- Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B072JK9GX6 |
| Air Flow Capacity | 9.4 Cubic Meters Per Hour |
| Best Sellers Rank | #89 in Computer Case Fans |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,509) |
| Included Components | 1 |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.79"H |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Part Number | NF-A4x20 FLX |
| Power Connector Type | 3-Pin |
| UPC | 841500110116 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |
| Warranty Description | 6 year manufacturer’s warranty |

## Product Details

- **Air Flow Capacity:** 9.4 Cubic Meters Per Hour
- **Brand:** Noctua
- **Compatible Devices:** Desktop
- **Cooling Method:** Air
- **Material:** Fibre-glass reinforced PBT
- **Maximum Rotational Speed:** 5000 RPM
- **Noise Level:** 14.9 Decibels
- **Power Connector Type:** 3-Pin
- **Product Dimensions:** 1.57"L x 1.57"W x 0.79"H
- **Voltage:** 12 Volts

## Images

![Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)
![Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 2](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg)
![Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 3](https://m.media-amazon.com/images/I/71NYZ3JQcOL.jpg)
![Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 4](https://m.media-amazon.com/images/I/71Ywc8LceeL.jpg)
![Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 5](https://m.media-amazon.com/images/I/61xqdXxj1uL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Whats the cfm of this fan?**
A: The output, converted from 9.4 m3/h is just 5.5 cfm, very low indeed.

**Q: 14.9dba at what speed?**
A: 5000rpm.

**Q: How many dB is this fan?**
A: 14.9db(a)

**Q: What is the mtbf. How many hours of life can I expect from one of these?**
A: Not sure about the Mtbf, but i purchased 2 of this in Jan 2020, and they have been running 24/7 till now with no problems. Installed them in my 2 poe+ switches

## Frequently Bought Together

- Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)
- Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)
- Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-06-13*