---
product_id: 256239121
title: "NF-A4x20 FLX Computer Case Fan - Computer Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)"
brand: "noctua"
price: "€ 50.38"
currency: EUR
in_stock: true
reviews_count: 8
category: "Noctua"
url: https://www.desertcart.com.cy/products/256239121-nf-a4x20-flx-computer-case-fan-computer-cooling-components-computer
store_origin: CY
region: Cyprus
---

# 4400 RPM max speed 40x40x20 mm compact size Ultra-quiet 14.9 dB noise level NF-A4x20 FLX Computer Case Fan - Computer Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)

**Brand:** noctua
**Price:** € 50.38
**Availability:** ✅ In Stock

## Summary

> 🌀 Small fan, big impact—cool smarter, not louder!

## Quick Answers

- **What is this?** NF-A4x20 FLX Computer Case Fan - Computer Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) by noctua
- **How much does it cost?** € 50.38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/256239121-nf-a4x20-flx-computer-case-fan-computer-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

- • **Award-Winning Design:** Flow acceleration channels boost airflow efficiency while maintaining silent operation
- • **Versatile Compatibility:** Ideal for desktops, routers, switches, NAS, and DVRs—cool every critical device
- • **Whisper-Quiet Performance:** Advanced acoustic optimization keeps noise at a barely-there 14.9 dB
- • **Complete Installation Kit Included:** Anti-vibration mounts, screws, extension cable, and Omnijoin adapter for seamless setup
- • **Precision Cooling in a Compact Frame:** 40mm size fits perfectly in tight spaces like 1U servers and network devices

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm computer case fan delivering up to 4400 RPM with ultra-quiet 14.9 dB noise levels. Engineered with award-winning flow acceleration channels and acoustic optimization, it’s perfect for compact setups like 1U servers, routers, and NAS devices. Comes with a full accessory kit for easy, vibration-free installation, making it the go-to choice for professionals demanding silent, efficient cooling in tight spaces.

## Description

Noctua NF-A4x20 FLX - NF-A4x20 FLX Computer case Fan (NF-A4x20 FLX Fan - 40mm - Warranty: 1Y)

Review: Nice cooler for sff aystem - Its nice for the small pc
Review: Silence - After replacement in switch, it became silent

## Features

- Noctua Nf A4X20 Flx Computer Case Fan Computer Cooling Components Computer Case Fan 4Cm 3700Rpm 5000Rpm 4400Rpm
- Award Winning A Series Design With Flow Acceleration Channels And Advanced Acoustic Optimization Frame For Superior, Quiet Cooling Performance
- Brand: Noctua
- 40X20Mm Size, Ideal For 1U Applications Or Replacing Fans In Network And Storage Devices, Routers, Switches, Nas, Etc. Or Other Devices Such As Dvr.
- Includes Anti Vibration Mounts, Fan Screws, Extension Cable, And Omnijoin Adapter Set To Connect The Fan To Proprietary Fan Strips.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B072JK9GX6 |
| Air Flow Capacity | 9.4 Cubic Meters Per Hour |
| Best Sellers Rank | #11,148 in Computers ( See Top 100 in Computers ) #61 in Computer Case Fans |
| Brand Name | Noctua |
| Compatible Devices | Desktop, Server, Router, Switch |
| Cooling Method | Air |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,368) |
| Item Dimensions L x W x H | 40L x 40W x 20H millimeters |
| Manufacturer | Noctua |
| Material Type | Plastic |
| Maximum Rotational Speed | 4400 RPM |
| Model | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Part Number | NF-A4x20 FLX |
| Power Connector Type | 3-Pin |
| UPC | 841500110116 |
| Unit Count | 1 Count |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Noctua
- **Cooling method:** Air
- **Power connector type:** 3-Pin
- **Product dimensions:** 40L x 40W x 20H millimeters
- **Voltage:** 12 Volts

## Images

![NF-A4x20 FLX Computer Case Fan - Computer Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)

## 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice cooler for sff aystem
*by W***S on 28 March 2024*

Its nice for the small pc

### ⭐⭐⭐⭐⭐ Silence
*by P***W on 9 September 2020*

After replacement in switch, it became silent

### ⭐⭐⭐⭐⭐ High quality
*by W***B on 14 October 2020*

Very good performance and quiet. I'm using it on 3D printer to cool E3D V6 hotend.

## 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 Cyprus*
*Store origin: CY*
*Last updated: 2026-05-20*