---
product_id: 47568525
title: "NF-A4x20 FLX"
brand: "noctua"
price: "$U1671"
currency: UYU
in_stock: null
reviews_count: 8
category: "Noctua"
url: https://www.desertcart.uy/products/47568525-nf-a4x20-flx
store_origin: UY
region: Uruguay
---

# 5000 RPM max speed Ultra-quiet 14.9 dB(A) noise level >150,000 h MTTF reliability NF-A4x20 FLX

**Brand:** noctua
**Price:** $U1671
**Availability:** ❌ Out of Stock

## Summary

> 🌀 Silence Meets Power: The Ultimate Compact Cooling Solution

## Quick Answers

- **What is this?** NF-A4x20 FLX by noctua
- **How much does it cost?** $U1671 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/47568525-nf-a4x20-flx)

## 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:** Fiberglass-reinforced PBT material and >150,000 hours MTTF ensure long-term, maintenance-free performance.
- • **Compact Powerhouse:** 40x40x20 mm size engineered for tight 1U spaces, perfect for network gear and compact devices.
- • **Award-Winning Design:** Flow Acceleration Channels and Acoustic Optimisation frame deliver superior cooling with minimal noise.
- • **Plug & Play Versatility:** Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for seamless integration with proprietary headers.
- • **Precision Speed Control:** Three RPM settings (5000/4400/3700) via Low-Noise Adaptors for tailored airflow or whisper-quiet operation.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm 12V computer fan designed for ultra-quiet, efficient cooling in compact spaces like 1U servers and network equipment. Featuring three adjustable speeds up to 5000 RPM, advanced aerodynamic design, and a noise level as low as 14.9 dB(A), it ensures optimal airflow with minimal sound. The fan includes versatile mounting accessories and connectors for easy installation and boasts a remarkable >150,000-hour mean time to failure, making it a reliable upgrade for professionals seeking silent, high-performance cooling.

## 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

Review: Perfect for network switch fan replacement projects - Noctua is an amazing company - I purchased an unmanaged 5 port, 10gbe / 100gbs network switch to put in my makeshift networking closet. Closet is about 6 feet from my work station. Switch works GREAT, but has a 40mm fan that is legit 40db loud on the tech sheet for it but more like 50db in real life which is like having a conversation with a person loud. To remedy the issue, I purchased this fan. The fan itself is of the high quality and acumen for brown color tones one would expect from Noctua, so I'm not even going to touch on that. What is the most amazing about this purchase is everything else it comes with the kit and how Noctua caters to the primary use case for their customers here. My OEM fan has a 2 pin connector to the PCB. Noctua includes a converter so you can splice the OEM 2 pin together with the converter that plugs into the 3 pin coming from the fan. In addition, Noctua provides 3 tool-less (mostly) connectors for the splice. When you crush them down it squirts some kind of non conductive oil into the connections to protect it from water and dust. Made by 3M, but nevertheless a WELL thought out solution to include for their customers. Running at 4000+ rpm is extremely unnecessary for this network switch & since silence is the name of the game for me a way to reduce RPM without implementing a PWM controller in my limited space configuration. Another whammy from Noctua for this problem. Two RPM cables are included that step down the rpm without the need for a separate controller. I used the ultra low noise cable. It reduce the noise some, but the fan itself made such a difference that alone should do the trick for most people. I've purchased a lot of PC components and networking hardware over the years. Not sure I've ever felt like a company thought this much about their customer for something that costs such a small amount of money. The time and frustration they saved me is immeasurable and priceless. Good job Noctua :-)
Review: Fits the Icom IC-2730B - The IC-2730 is a great radio, but it has a fan that comes on as soon as you transmit in high power mode. Then it stays on for a minute or more even if you only keyed up for a second or so. And the fan is loud! In medium power mode, it takes 10 or 15 seconds for the fan to come on and then it stays on for a while. This Noctua fan fits the radio perfectly and is so quiet that it is hard to tell if it is running or not. That is no exaggeration. Installation is easy but requires that the connector from the old fan be spliced onto the wires of the new fan. The new fan comes with solderless connectors to do this, but they are too big, so I just cut the wires and spliced them, soldering the connections. Just ignore the yellow wire from the fan; it is not needed in this radio. Note that the fan blows into the radio, not out. This easy modification makes a great radio better.

## 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 | #91 in Computer Case Fans |
| Brand | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Date First Available | July 12, 2017 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 6 ounces |
| Item model number | NF-A4x20 FLX |
| Manufacturer | Noctua |
| 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 |
| UPC | 841500110116 |
| Voltage | 12 Volts |

## 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

![NF-A4x20 FLX - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)
![NF-A4x20 FLX - Image 2](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg)
![NF-A4x20 FLX - Image 3](https://m.media-amazon.com/images/I/71NYZ3JQcOL.jpg)
![NF-A4x20 FLX - Image 4](https://m.media-amazon.com/images/I/71Ywc8LceeL.jpg)
![NF-A4x20 FLX - 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for network switch fan replacement projects - Noctua is an amazing company
*by P***K on November 15, 2024*

I purchased an unmanaged 5 port, 10gbe / 100gbs network switch to put in my makeshift networking closet. Closet is about 6 feet from my work station. Switch works GREAT, but has a 40mm fan that is legit 40db loud on the tech sheet for it but more like 50db in real life which is like having a conversation with a person loud. To remedy the issue, I purchased this fan. The fan itself is of the high quality and acumen for brown color tones one would expect from Noctua, so I'm not even going to touch on that. What is the most amazing about this purchase is everything else it comes with the kit and how Noctua caters to the primary use case for their customers here. My OEM fan has a 2 pin connector to the PCB. Noctua includes a converter so you can splice the OEM 2 pin together with the converter that plugs into the 3 pin coming from the fan. In addition, Noctua provides 3 tool-less (mostly) connectors for the splice. When you crush them down it squirts some kind of non conductive oil into the connections to protect it from water and dust. Made by 3M, but nevertheless a WELL thought out solution to include for their customers. Running at 4000+ rpm is extremely unnecessary for this network switch & since silence is the name of the game for me a way to reduce RPM without implementing a PWM controller in my limited space configuration. Another whammy from Noctua for this problem. Two RPM cables are included that step down the rpm without the need for a separate controller. I used the ultra low noise cable. It reduce the noise some, but the fan itself made such a difference that alone should do the trick for most people. I've purchased a lot of PC components and networking hardware over the years. Not sure I've ever felt like a company thought this much about their customer for something that costs such a small amount of money. The time and frustration they saved me is immeasurable and priceless. Good job Noctua :-)

### ⭐⭐⭐⭐⭐ Fits the Icom IC-2730B
*by E***N on September 25, 2025*

The IC-2730 is a great radio, but it has a fan that comes on as soon as you transmit in high power mode. Then it stays on for a minute or more even if you only keyed up for a second or so. And the fan is loud! In medium power mode, it takes 10 or 15 seconds for the fan to come on and then it stays on for a while. This Noctua fan fits the radio perfectly and is so quiet that it is hard to tell if it is running or not. That is no exaggeration. Installation is easy but requires that the connector from the old fan be spliced onto the wires of the new fan. The new fan comes with solderless connectors to do this, but they are too big, so I just cut the wires and spliced them, soldering the connections. Just ignore the yellow wire from the fan; it is not needed in this radio. Note that the fan blows into the radio, not out. This easy modification makes a great radio better.

### ⭐⭐⭐⭐⭐ A fan that lives up to Noctua’s reputation
*by L***N on January 12, 2019*

I recently upgraded the case for my computer. The new case had much quieter fans than my old one. Happy as a peacock, I set about using it, only to be disturbed by a high pitched whine that quickly got on my nerves. A little investigation and I discovered that the stock 40mm fan that helped cool a component on my motherboard was the culprit. So I went looking for a replacement. Enter the Noctua fan. I was familiar with Noctua from research I’d done about CPU cooler fans a few years ago. Their reputation is very good. That inspired my purchase of this fan over other less expensive brands. I wasn’t disappointed. This fan is quiet. There is very little noise other than the sound of air moving through it. Even that is minimal. Obviously, that is exactly what I was looking for, so it fits the bill perfectly. I wanted a fan that wouldn't disturb the peace. This one is quiet as a mouse. Overview: The fan comes with a standard 3 pin connector that is common on many motherboards and electronics. It also has an assortment of additional items in the box. This includes a short extension cable, low noise adapters that reduce the speed of the fan and 4 omnijon clips , so you can easily remove the included 3 pin connector and connect a new one if needed. A set of case screws and anti-vibration mounts are also included in the box. The fan itself has silicon pads on the corners to help cut down on vibration. Unlike other reviewers, I had no issue with them falling off. I did not use any of the mounting options provided in the box as I simply used the mounting solution my mother board already provided. I suspect that the anti-vibration mounts would be one time use. They’re shaped like Christmas tree clips and would probably get shredded when removed. Another bonus is that it has a nicely presented set of instructions explaining how to use the adapters and silicon mounts. Bottom line: The packaging for this fan is crazy. It comes in a double book fold cardboard box with a molded plastic tray. I guess they’re trying to give the impression of quality with the packaging, but it really seems like overkill for a product that cost only 14 dollars. Noctua wants its customers to feel like they got a quality product by providing one and packaging it like one. Well, it worked. This is a great little fan.

## 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 Uruguay*
*Store origin: UY*
*Last updated: 2026-03-01*