---
product_id: 51055764
title: "NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)"
brand: "noctua"
price: "1226599₫"
currency: VND
in_stock: true
category: "Noctua"
url: https://www.desertcart.vn/products/51055764-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm-brown
store_origin: VN
region: Vietnam
---

# >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)

**Brand:** noctua
**Price:** 1226599₫
**Availability:** ✅ In Stock

## Summary

> 🛠️ Silent cooling that means business — keep your gear cool, calm, and collected.

## Quick Answers

- **What is this?** NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) by noctua
- **How much does it cost?** 1226599₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/51055764-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm-brown)

## 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:** Crafted with fibre-glass reinforced PBT and backed by a 6-year warranty, ensuring long-term, dependable cooling performance.
- • **Compact Yet Mighty:** 40x40x20 mm size fits perfectly in tight 1U spaces, ideal for network gear, NAS, and DVRs without compromise.
- • **Whisper-Quiet Power:** Experience premium airflow at a barely-there 14.9 dB noise level—your workspace’s new silent hero.
- • **Precision Speed Control:** 3-pin FLX design with three RPM settings (5000/4400/3700) lets you dial in the perfect balance of cooling and silence.
- • **Vibration-Free Operation:** Includes anti-vibration mounts and OmniJoin adaptor for seamless, rattle-free installation and compatibility.

## Overview

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm 12V fan engineered for ultra-quiet, high-performance cooling in compact devices like network switches and NAS units. Featuring advanced aerodynamic design, three adjustable speed settings, and anti-vibration accessories, it delivers reliable airflow at a whisper-quiet 14.9 dB(A) noise level with an exceptional lifespan exceeding 150,000 hours. Perfect for professionals seeking silent, efficient thermal management in tight spaces.

## 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 | 6,716 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 27 in Thermal Management Products 76 in Fans & Cooling |
| Brand | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Country Of Origin | China |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,502) |
| Global Trade Identification Number | 09010018100112 |
| Item Dimensions L x W x H | 40L x 40W x 20H millimetres |
| Item Weight | 50 Grams |
| Manufacturer | Noctua |
| Manufacturer Part Number | NF-A4x20 FLX |
| Material | Fibre-glass reinforced PBT |
| Max Rotational Speed | 5000 RPM |
| Model Number | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Number of Items | 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:** Desktop
- **Cooling method:** Air
- **Global Trade Identification Number:** 09010018100112
- **Material:** Fibre-glass reinforced PBT
- **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, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)

## 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.vn/products/51055764-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm-brown](https://www.desertcart.vn/products/51055764-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm-brown)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-05-21*