---
product_id: 51055764
title: "Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm"
brand: "noctua"
price: "4801 kr"
currency: ISK
in_stock: true
category: "Noctua"
url: https://www.desertcart.is/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm
store_origin: IS
region: Iceland
---

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

**Brand:** noctua
**Price:** 4801 kr
**Availability:** ✅ In Stock

## Summary

> 🌀 Quiet power in a compact package — cool smarter, work better.

## Quick Answers

- **What is this?** Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm by noctua
- **How much does it cost?** 4801 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/51055764-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:** Engineered for >150,000 hours MTTF backed by a 6-year warranty — reliability that keeps your critical systems cool and running.
- • **Compact Powerhouse:** Slim 40x40x20mm size fits seamlessly into 1U servers, routers, NAS, and other professional gear without compromise.
- • **Whisper-Quiet Operation:** Advanced Acoustic Optimisation and Flow Acceleration Channels ensure near-silent cooling, perfect for noise-sensitive workspaces.
- • **Vibration-Free Stability:** Includes anti-vibration mounts and OmniJoin adaptor set for secure, rattle-free installation in any setup.
- • **Precision Airflow Control:** Three-speed FLX settings (5000/4400/3700 RPM) let you tailor cooling performance or silence to your exact needs.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20mm high-performance fan designed for professional-grade cooling in compact devices like 1U servers, routers, and NAS units. Featuring three adjustable speeds up to 5000 RPM, ultra-low noise levels at 14.9 dB(A), and advanced aerodynamic design, it delivers efficient airflow with whisper-quiet operation. Its robust build ensures over 150,000 hours of reliable service, supported by a 6-year warranty, making it the go-to choice for managers demanding silent, dependable cooling in critical network and storage equipment.

## Description

Highly optimized 40x20mm fan with advanced aerodynamic design delivers superior quiet cooling performance for 1U devices, network equipment, and more.

## Features

- Premium quiet fan, 40x40x20 mm, 12V, 3-pin Molex, 5000/4400/3700 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 | B071J8CZP9 |
| Best Sellers Rank | 3,617 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 32 in Thermal Management Products 103 in Fans & Cooling |
| Brand | Noctua |
| Compatible Devices | Server, Router, NAS, Switch, Video Recorder |
| Cooling Method | Air |
| Country Of Origin | China |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,623) |
| Global Trade Identification Number | 09010018100112 |
| Item Dimensions L x W x H | 40L x 40W x 20H millimetres |
| Item Highlight | High Airflow, Low Noise, 20mm Thick, for PC and Electronics Cooling, 3 Speed Settings 5000/4400/3700rpm 3-Pin |
| Item Weight | 50 Grams |
| Manufacturer | Noctua |
| Manufacturer Part Number | NF-A4x20 FLX |
| Max Rotational Speed | 5000 RPM |
| Model Number | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Connector Type | 3-Pin |
| Product Warranty | 6 year manufacturer’s warranty |
| Unit Count | 1.0 count |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Noctua
- **Compatible devices:** Server, Router, NAS, Switch, Video Recorder
- **Cooling method:** Air
- **Global Trade Identification Number:** 09010018100112
- **Maximum rotational speed:** 5000 RPM
- **Noise level:** 14.9 Decibels
- **Power connector type:** 3-Pin
- **Product dimensions:** 40L x 40W x 20H millimetres
- **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: How can I use this fan with a 2 pin connection. I’ve just received it only to find my connection is 2 pin. Doh!**
A: Black is (-), red is (+) and yellow is just the probe. You disconnect/cut the yellow one and you have two active wires.

**Q: You replaced Hikvision nvr fan with Noc 40x20. What voltage did u use 12 or 5?**
A: This Noctua fan is rated 5V and this is the voltage to use.

**Q: has anyone tried this in a dan a4 case as a top fan? And would it be worth doing?**
A: I don't know where it would fit at the top of the A4, as the riser cables and psu cable take up the space, there might just be enough space on the GPU side. I have this fan zip-tied to the CPU side panel.

**Q: Good day, when will this item be back in stock again?**
A: it is https://www.amazon.co.uk/gp/offer-listing/B009NQLT0M/ref=dp_olp_new_mbc?ie=UTF8&condition=new

## Frequently Bought Together

- Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)
- Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)

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**Shop now:** [https://www.desertcart.is/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm](https://www.desertcart.is/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-10-08*