---
product_id: 258574069
title: "NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)"
brand: "noctua"
price: "373 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Noctua"
url: https://www.desertcart.dk/products/258574069-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v
store_origin: DK
region: Denmark
---

# 150,000+ hours MTTF 5000 RPM max speed Ultra-quiet 14.9 dB(A) NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

**Brand:** noctua
**Price:** 373 kr
**Availability:** ✅ In Stock

## Summary

> 🌀 Silent power in a compact frame—cool smarter, not louder.

## Quick Answers

- **What is this?** NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) by noctua
- **How much does it cost?** 373 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/258574069-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v)

## 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:** Over 150,000 hours mean-time-to-failure guarantees reliability that keeps your critical devices running smoothly.
- • **Compact Powerhouse:** 40x40x20 mm size fits perfectly in tight spots like NVIDIA Jetson Nano and 1U servers without compromise.
- • **Award-Winning Design:** Flow Acceleration Channels and Acoustic Optimization frame deliver superior airflow with minimal noise—engineered for pros.
- • **Precision PWM Control:** 4-pin PWM ensures dynamic speed adjustment for optimal cooling and energy efficiency.
- • **Whisper-Quiet Cooling:** Experience near-silent airflow with industry-leading 14.9 dB(A) noise levels—keep your workspace zen.

## Overview

The Noctua NF-A4x20 5V PWM is a premium 40x40x20 mm quiet fan designed for professional-grade cooling in compact devices like network switches and NVIDIA Jetson Nano. Featuring a max speed of 5000 RPM, ultra-low noise of 14.9 dB(A), and a robust lifespan exceeding 150,000 hours, it combines advanced aerodynamic design with PWM control for efficient, whisper-quiet performance.

## Description

Noctua NF-A4x20 5V PWM, 4-Pin Premium Quiet Fan, 40mm, Brown

Review: Amazing silent fan - I order two silent fans and replace a very loud original fans for network switch. Amazing performance no sound at all.
Review: Excellent product - This items working perfectly more than original FANs which coming on QNAP 10g managed switch. Very quiet and cooling the switch. Highly Recommended for others

## Features

- Premium quiet fan, 40x40x20 mm, 5V, 4-pin PWM, max. 5000 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 NVIDIA Jetson Nano, 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B071FNHVXN |
| Are Batteries Included | No |
| Best Sellers Rank | #21,027 in Computers ( See Top 100 in Computers ) #129 in Computer Case Fans |
| Brand | Noctua |
| Color | Brown |
| Customer Reviews | 4.8 4.8 out of 5 stars (4,747) |
| Date First Available | 3 June 2017 |
| Item Weight | 84 g |
| Item model number | NF-A4x205VPWM |
| Manufacturer | Noctua |
| Product Dimensions | 2 x 4 x 4 cm; 84 g |
| Voltage | 5 Volts |

## Product Details

- **Brand:** Noctua
- **Cooling method:** Air
- **Power connector type:** 4-Pin
- **Product dimensions:** 20L x 40W x 40H millimeters
- **Voltage:** 5 Volts

## Images

![NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)

## Questions & Answers

**Q: what is the cfm rating?**
A: 5.532631039983588 CFM

**Q: Can these be wired to a usb connector and run off a usb wall charger?**
A: Yes. I run mine off of the gpio pins on a raspberry pi. That's the same concept.

**Q: Does this noctua nf-a4x20 5v pwm premium-quality quiet 40mm fan come with the mounting screws?**
A: Yes, it comes with screws a couple of different connectors for attaching it to 3 and 4 pin connections also some rubbery plug things to pull through the mount holes.

**Q: Can a 3.3v PWM signal be used to control fan speed?**
A: Yes, a 3.3V logic (PWM) signal will control this fan.  I use an Arduino DUE board to control this fan.  The DUE puts out 3.3V logic signals.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Amazing silent fan
*by R***X on 12 November 2022*

I order two silent fans and replace a very loud original fans for network switch. Amazing performance no sound at all.

### ⭐⭐⭐⭐⭐ Excellent product
*by M***I on 20 October 2022*

This items working perfectly more than original FANs which coming on QNAP 10g managed switch. Very quiet and cooling the switch. Highly Recommended for others

### ⭐⭐⭐⭐⭐ Very quiet
*by J***I on 23 April 2022*

Bought this to replace my noisy 3D printer hotend fan. It is quiet now.

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- Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
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**Shop now:** [https://www.desertcart.dk/products/258574069-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v](https://www.desertcart.dk/products/258574069-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-31*