---
product_id: 263809764
title: "Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown)"
brand: "noctua"
price: "$70.23"
currency: USD
in_stock: true
reviews_count: 5
category: "Noctua"
url: https://www.desertcart.us/products/263809764-noctua-noctua-nf-a4x20-5v-3-pin-premium-quiet-fan
store_origin: US
region: United States of America
---

# >150,000 hours MTTF for long-lasting reliability 5000 RPM high-speed airflow Ultra-quiet 14.9 dB(A) noise level Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown)

**Brand:** noctua
**Price:** $70.23
**Availability:** ✅ In Stock

## Summary

> 🛠️ Upgrade your gear with the quiet power of Noctua — because your tech deserves premium airflow without the noise!

## Quick Answers

- **What is this?** Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) by noctua
- **How much does it cost?** $70.23 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/263809764-noctua-noctua-nf-a4x20-5v-3-pin-premium-quiet-fan)

## 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

- • **Whisper-Quiet Cooling:** Experience premium airflow without the distracting noise—perfect for focused workspaces and silent server rooms.
- • **5V 3-Pin Compatibility:** Optimized for 5V industrial applications with versatile 3-pin Molex and OmniJoin adapters for effortless integration.
- • **Compact 40x40x20mm Design:** Fits seamlessly into tight 1U rack spaces, network gear, and compact devices where space is at a premium.
- • **Award-Winning Aerodynamics:** Flow Acceleration Channels and Acoustic Optimization frame deliver superior cooling efficiency with minimal sound.
- • **Complete Anti-Vibration Kit Included:** Reduce unwanted vibrations and extend device lifespan with included mounts, screws, and extension cables.

## Overview

The Noctua NF-A4x20 5V is a premium 40mm quiet fan engineered for professional-grade cooling in compact devices. Operating at 5000 RPM with an ultra-low noise level of 14.9 dB(A), it features advanced aerodynamic design and comes with anti-vibration mounts and versatile adapters. Ideal for 1U servers, network switches, NAS, and other 5V industrial applications, it offers exceptional reliability with a mean time to failure exceeding 150,000 hours.

## Description

Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) Brand : Noctua.

Review: Good airflow, quiet, omnijoin adapter is good, overkill box - I used the noctua fan to replace a loud fan in a network switch. The OmniJoin adapter that was included was easily usable and works well. I had to use the anti-vibration fan connectors because the previous fan screw holes were smaller than the noctua fan screw holes. The anti-vibration fan connectors were installed and trimmed, but the network switch case didn't fit properly over the anti-vibration fan connectors. It had to be shoved on, but it worked out. The fan moves a good amount of air, but not as much as the original fan. This is still enough air to keep the switch cool, while being fairly quiet. The fan is still audible (at 5v constant, non-PWM), but I believe this is mostly due to the design of the case, not the fan's fault. The box is a bit overkill and has great presentation, but I would rather the item cost less than have a fancy box. Overall, this is a great product and can make most server gear into home gear. There isn't much for competition of noctua's 40mm quiet fans, so you kind of have to deal with noctua's high prices if you need a quiet 40mm fan.
Review: Work great and very quiet - Work great cooling my bit axe solo miners

## Features

- Premium quiet fan, 40x40x20 mm, 5V, 3-pin Molex, 5000 RPM, 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
- 5V 3-pin version (5000rpm) for 5V-based industrial applications or replacing 5V fans in various devices
- 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 | B072Q3CMRW |
| Best Sellers Rank | #152,050 in Computers ( See Top 100 in Computers ) #1,395 in Computer Case Fans |
| Brand | Noctua |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Compatible devices | Desktop |
| Cooling Method | Air |
| Cooling method | Air |
| Customer Reviews | 4.8 out of 5 stars 378 Reviews |
| Item Dimensions L x W x H | 40L x 40W x 20H millimeters |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x20 5V |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Part Number | NF-A4x20 5V |
| Power Connector Type | 3-Pin |
| Power connector type | 3-Pin |
| Product dimensions | 40L x 40W x 20H millimeters |
| UPC | 841500110123 |
| Unit Count | 1.0 Count |
| Voltage | 5 Volts |

## Product Details

- **Brand:** Noctua
- **Compatible devices:** Desktop
- **Cooling method:** Air
- **Power connector type:** 3-Pin
- **Voltage:** 5 Volts

## Images

![Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)
![Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) - Image 2](https://m.media-amazon.com/images/I/71tPkk5TaXL.jpg)
![Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) - Image 3](https://m.media-amazon.com/images/I/81trIc57WdL.jpg)
![Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) - Image 4](https://m.media-amazon.com/images/I/71+IJ7qyW-L.jpg)
![Noctua Noctua NF-A4x20 5V, 3-Pin Premium Quiet Fan (40mm, Brown) - Image 5](https://m.media-amazon.com/images/I/71G5+G0k2+L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good airflow, quiet, omnijoin adapter is good, overkill box
*by A***A on 28 April 2020*

I used the noctua fan to replace a loud fan in a network switch. The OmniJoin adapter that was included was easily usable and works well. I had to use the anti-vibration fan connectors because the previous fan screw holes were smaller than the noctua fan screw holes. The anti-vibration fan connectors were installed and trimmed, but the network switch case didn't fit properly over the anti-vibration fan connectors. It had to be shoved on, but it worked out. The fan moves a good amount of air, but not as much as the original fan. This is still enough air to keep the switch cool, while being fairly quiet. The fan is still audible (at 5v constant, non-PWM), but I believe this is mostly due to the design of the case, not the fan's fault. The box is a bit overkill and has great presentation, but I would rather the item cost less than have a fancy box. Overall, this is a great product and can make most server gear into home gear. There isn't much for competition of noctua's 40mm quiet fans, so you kind of have to deal with noctua's high prices if you need a quiet 40mm fan.

### ⭐⭐⭐⭐⭐ Work great and very quiet
*by A***R on 20 March 2026*

Work great cooling my bit axe solo miners

### ⭐⭐⭐⭐⭐ Excellent fan, but not for bitaxe
*by N***X on 28 October 2025*

Love Noctua. I bought this to replace my high RPM fan on my Bitaxe gamma, since the stock fan is so loud (7000rpm). However, it does not meet the performance required to sufficiently cool the Bitaxe at 5000rpm. There is also a PWM version but it's also not recommended since you will likely have to put the fan to 100% anyways. Great fan, great company - just did not work for my specific application.

## Frequently Bought Together

- Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown)
- Noctua NF-A4x10 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x10mm, Brown)
- OPSFALCON 2 Pack USB to 3-Pin / 4-Pin PWM 5V USB Sleeved Fan Power Adapter Cable, USB to 3 Pin / 4 Pin Case Fan Adapter Connector Cable (USB-3Pin/4Pin Cable)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-08*