---
product_id: 51055764
title: "Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm"
brand: "noctua"
price: "¥5276"
currency: JPY
in_stock: true
category: "Noctua"
url: https://www.desertcart.jp/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm
store_origin: JP
region: Japan
---

# >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:** ¥5276
**Availability:** ✅ In Stock

## Summary

> 🌀 Stay cool, stay ahead — silent power in a compact package!

## Quick Answers

- **What is this?** Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm by noctua
- **How much does it cost?** ¥5276 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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:** Award-winning design backed by a 6-year warranty and industry-leading >150,000 hours mean time to failure.
- • **Precision Cooling Power:** High-performance 40x20mm fan engineered for optimal airflow in compact 1U devices and network gear.
- • **Whisper-Quiet Operation:** Advanced Acoustic Optimisation ensures near-silent performance, perfect for noise-sensitive professional environments.
- • **Vibration-Free Stability:** Includes anti-vibration mounts and OmniJoin adaptor for seamless, secure installation and reduced mechanical noise.
- • **Customizable Speed Settings:** 3-pin FLX design with Low-Noise Adaptors lets you dial in from 3700 to 5000 RPM for tailored cooling vs. silence balance.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20mm quiet fan designed for professional-grade cooling in compact 1U servers, routers, NAS, and other network devices. Featuring a max speed of 5000 RPM with adjustable settings, ultra-low noise levels at 14.9 dB(A), and exceptional durability with over 150,000 hours MTTF, it delivers reliable, whisper-quiet airflow. Its advanced aerodynamic design and included anti-vibration accessories ensure stable, silent operation, making it the go-to choice for tech-savvy professionals demanding efficient thermal management.

## 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 | 2,461 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 15 in Thermal Management Products 52 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 (2,610) |
| Global Trade Identification Number | 09010018100112 |
| Item Dimensions L x W x H | 40L x 40W x 20H millimetres |
| Item Weight | 20 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.jp/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm](https://www.desertcart.jp/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-27*