---
product_id: 51055764
title: "NF-A4x20 FLX, High-Performance Quiet Fan 40mm"
brand: "noctua"
price: "AR$72706"
currency: ARS
in_stock: true
reviews_count: 13
category: "Noctua"
url: https://www.desertcart.com.ar/products/51055764-nf-a4x20-flx-high-performance-quiet-fan-40mm
store_origin: AR
region: Argentina
---

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

**Brand:** noctua
**Price:** AR$72706
**Availability:** ✅ In Stock

## Summary

> 🌀 Silence meets power: The fan your tech deserves.

## Quick Answers

- **What is this?** NF-A4x20 FLX, High-Performance Quiet Fan 40mm by noctua
- **How much does it cost?** AR$72706 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/51055764-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:** Over 150,000 hours of mean time to failure backed by a 6-year warranty — reliability you can trust.
- • **Adaptive Speed Control:** Three-speed settings let you dial in the perfect balance of airflow and silence.
- • **Plug & Play Versatility:** 3-pin FLX connector plus OmniJoin adaptors ensure seamless integration with your gear.
- • **Precision Cooling Power:** Turbocharge your 1U devices with up to 5000 RPM airflow for peak performance.
- • **Whisper-Quiet Operation:** Experience near-silent efficiency at just 14.9 dB(A) — because noise is so last decade.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20mm quiet fan engineered for high airflow and ultra-low noise, featuring advanced aerodynamic design and three adjustable speeds (up to 5000 RPM). Ideal for 1U servers, routers, NAS, and other compact electronics, it includes anti-vibration mounts and versatile connectors for easy installation. With a remarkable lifespan exceeding 150,000 hours and a 6-year warranty, it’s the go-to cooling solution for professionals demanding silent, reliable performance.

## Description

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

Review: I’m fan ! - Very good quality, super quiet and efficient, very good value with every connector included .
Review: Can't Beat Noctua Fans - The Noctua NF-A4x20 FLX is a premium quiet fan known for its exceptional build quality and performance. Designed with advanced aerodynamic engineering, this 40x20mm fan provides efficient cooling while maintaining low noise levels. Its 3-pin connector ensures broad compatibility, making it ideal for a variety of applications, from computer cooling to DIY projects. Users appreciate its robust design, long lifespan, and the inclusion of multiple mounting options. Overall, the NF-A4x20 FLX is a top choice for anyone seeking a reliable and silent cooling solution.

## 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 | 5,773 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 55 in Thermal Management Products 134 in Fans & Cooling |
| Brand | Noctua |
| Compatible Devices | Server, Router, NAS, Switch, Video Recorder |
| Compatible devices | Server, Router, NAS, Switch, Video Recorder |
| Cooling Method | Air |
| Cooling method | Air |
| Country Of Origin | China |
| Customer Reviews | 4.8 out of 5 stars 2,620 Reviews |
| 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 |
| Power connector type | 3-Pin |
| Product Warranty | 6 year manufacturer’s warranty |
| Product dimensions | 40L x 40W x 20H millimetres |
| 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

![NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.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

## Customer Reviews

### ⭐⭐⭐⭐⭐ I’m fan !
*by R***D on 17 July 2026*

Very good quality, super quiet and efficient, very good value with every connector included .

### ⭐⭐⭐⭐⭐ Can't Beat Noctua Fans
*by L***S on 28 June 2024*

The Noctua NF-A4x20 FLX is a premium quiet fan known for its exceptional build quality and performance. Designed with advanced aerodynamic engineering, this 40x20mm fan provides efficient cooling while maintaining low noise levels. Its 3-pin connector ensures broad compatibility, making it ideal for a variety of applications, from computer cooling to DIY projects. Users appreciate its robust design, long lifespan, and the inclusion of multiple mounting options. Overall, the NF-A4x20 FLX is a top choice for anyone seeking a reliable and silent cooling solution.

### ⭐⭐⭐⭐⭐ Excellent low noise replacement for OEM fans in network switch.
*by T***M on 7 October 2025*

I bought a POE switch (Drayek 1282 to be exact) - I had plans on mounting the switch to the wall behind my desk. I work in data centres a lot, so it shouldn't have surprised how loud the thing was. I took a gamble and bought a couple of these fans. The swap out was very easy - most PC kit will want a 12v fan (in case you were wondering to go with the 5v or 12v variant). The fans ship with everything you could need. My OEM fans connected to a 2 pin header on the main board. I cut the connectors from the old fans and used the included "OnmiJoin adaptor kit" to hook the new Noctua fans up to the original connectors. Again very easy. Mounting the fans in the chassis was easy as well. On power up the drop in noise was significant. Degrees of magnitude quieter. I ran for a day to check switch temperatures were staying low - all good. With that working well, I cracked open the switch again and added the (included) low noise adaptor - this just slows the fan RPM down a bit to reduce the fan noise. Again noticeable difference. Am now at the stage where the switch is under my desk and I can't hear it above the background noise anymore. Bearing in mind that with the OEM fans the noise levels were at the "extremely annoying " level on the other side of a closed door. Very happy - just wish I'd videoed the whole process.

## 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.com.ar/products/51055764-nf-a4x20-flx-high-performance-quiet-fan-40mm](https://www.desertcart.com.ar/products/51055764-nf-a4x20-flx-high-performance-quiet-fan-40mm)

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-09-18*