---
product_id: 47568525
title: "NF-A4x20 FLX"
brand: "noctua"
price: "€ 38.76"
currency: EUR
in_stock: true
category: "Noctua"
url: https://www.desertcart.at/products/47568525-nf-a4x20-flx
store_origin: AT
region: Austria
---

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

**Brand:** noctua
**Price:** € 38.76
**Availability:** ✅ In Stock

## Summary

> 🌀 Elevate your airflow game — small fan, massive impact!

## Quick Answers

- **What is this?** NF-A4x20 FLX by noctua
- **How much does it cost?** € 38.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/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

- • **Compact Yet Mighty:** Ultra-compact 40x40x20 mm size fits perfectly in 1U servers, NAS, routers, and DVRs without compromise.
- • **Tailored Speed Control:** Three-speed settings (5000/4400/3700 RPM) let you customize airflow for ultimate balance between power and silence.
- • **Precision Cooling Power:** Turbocharge airflow with up to 5000 RPM for peak performance in compact spaces.
- • **Whisper-Quiet Operation:** Experience near-silent cooling at just 14.9 dB(A) — because your focus deserves zero distractions.
- • **Vibration-Free Durability:** Includes anti-vibration mounts and premium build for stable, long-lasting performance backed by a 6-year warranty.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm computer case fan designed for high-performance cooling in tight spaces. Featuring a max speed of 5000 RPM, ultra-quiet operation at 14.9 dB(A), and over 150,000 hours mean time to failure, it offers customizable airflow with three speed settings and advanced acoustic optimization. Ideal for 1U servers, NAS, and network devices, it comes with anti-vibration mounts and a 6-year warranty, making it a reliable choice for professionals demanding silent, efficient 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

## 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 | #146 in Computer Case Fans |
| Brand | Noctua |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.8 out of 5 stars 2,513 Reviews |
| Included Components | 1 |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.79"H |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Part Number | NF-A4x20 FLX |
| Power Connector Type | 3-Pin |
| Product Dimensions | 1.57"L x 1.57"W x 0.79"H |
| UPC | 841500110116 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |
| Warranty Description | 6 year manufacturer’s warranty |

## 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)

## 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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---

*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-07-09*