---
product_id: 47568525
title: "Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm"
brand: "noctua"
price: "€ 37.81"
currency: EUR
in_stock: true
category: "Noctua"
url: https://www.desertcart.com.cy/products/47568525-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm
store_origin: CY
region: Cyprus
---

# >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm

**Brand:** noctua
**Price:** € 37.81
**Availability:** ✅ In Stock

## Summary

> 🌀 Quiet power that keeps your gear cool and your workspace zen.

## Quick Answers

- **What is this?** Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm by noctua
- **How much does it cost?** € 37.81 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/47568525-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm)

## 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

- • **Built to Last:** Crafted from fibre-glass reinforced PBT and backed by a 6-year warranty, this fan guarantees long-term, dependable performance.
- • **Compact Powerhouse:** Slim 40x40x20mm size fits seamlessly into tight 1U spaces, ideal for professional-grade network gear and compact PCs.
- • **Award-Winning Design:** Flow Acceleration Channels and Acoustic Optimisation frame deliver superior cooling with minimal noise—engineered for the discerning tech pro.
- • **Precision Airflow Control:** Three-speed FLX settings (5000/4400/3700 RPM) let you dial in the perfect balance of cooling power and whisper-quiet operation.
- • **Vibration-Free Performance:** Includes anti-vibration mounts and OmniJoin adaptor set for smooth, silent operation and easy integration with proprietary headers.

## Overview

The Noctua NF-A4x20 FLX is a premium 40mm high-performance fan designed for ultra-quiet, efficient cooling in compact spaces. Featuring three adjustable speeds up to 5000 RPM, advanced aerodynamic design, and anti-vibration accessories, it’s perfect for professional network equipment and small form-factor PCs. With a noise level as low as 14.9 dB(A) and a remarkable >150,000 hours MTTF, it combines durability with whisper-quiet operation, backed by a 6-year warranty.

## Description

Buy Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm | High Airflow, Low Noise, 20mm Thick, for PC and Electronics Cooling, 3 Speed Settings 5000/4400/3700rpm 3-Pin: 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 meter per hour |
| Best Sellers Rank | #72 in Computer Case Fans |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,525) |
| Included Components | 1 |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.79"H |
| Item Highlight | High Airflow, Low Noise, 20mm Thick, for PC and Electronics Cooling, 3 Speed Settings 5000/4400/3700rpm 3-Pin |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 rpm |
| Model | NF-A4x20 FLX |
| Noise Level | 14.9 db |
| Number of Packs | 1 |
| Part Number | NF-A4x20 FLX |
| Power Connector Type | 3-Pin |
| UPC | 841500110116 |
| Unit Count | 1 Count |
| Voltage | 12 volts |
| Warranty Description | 6 year manufacturer’s warranty |

## Product Details

- **Air Flow Capacity:** 9.4 cubic meter per hour
- **Brand:** Noctua
- **Compatible Devices:** Desktop
- **Cooling Method:** Air
- **Material:** Fibre-glass reinforced PBT
- **Maximum Rotational Speed:** 5000 rpm
- **Noise Level:** 14.9 db
- **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, High-Performance Quiet Fan 40mm - Image 1](https://m.media-amazon.com/images/I/41ErcWMfUuL.jpg)
![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 2](https://m.media-amazon.com/images/I/41EMb3tHSyL.jpg)
![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 3](https://m.media-amazon.com/images/I/41ho2AGquYL.jpg)
![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 4](https://m.media-amazon.com/images/I/41gy8bJ+OmL.jpg)
![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 5](https://m.media-amazon.com/images/I/31X2wDNrNIL.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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**Shop now:** [https://www.desertcart.com.cy/products/47568525-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm](https://www.desertcart.com.cy/products/47568525-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm)

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-10-22*