---
product_id: 51055796
title: "NF-A4x20 PWM, High-Performance Quiet Fan 40mm | High Airflow Low Noise 20mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 5000rpm 4-Pin PWM"
brand: "noctua"
price: "€ 39.04"
currency: EUR
in_stock: true
category: "Noctua"
url: https://www.desertcart.hr/products/51055796-nf-a4x20-pwm-high-performance-quiet-fan-40mm-high-airflow
store_origin: HR
region: Croatia
---

# >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) NF-A4x20 PWM, High-Performance Quiet Fan 40mm | High Airflow Low Noise 20mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 5000rpm 4-Pin PWM

**Brand:** noctua
**Price:** € 39.04
**Availability:** ✅ In Stock

## Summary

> 🌀 Cool smarter, not louder — the fan your gear deserves!

## Quick Answers

- **What is this?** NF-A4x20 PWM, High-Performance Quiet Fan 40mm | High Airflow Low Noise 20mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 5000rpm 4-Pin PWM by noctua
- **How much does it cost?** € 39.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/51055796-nf-a4x20-pwm-high-performance-quiet-fan-40mm-high-airflow)

## 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:** Sized at 40x40x20 mm, ideal for tight spaces like 1U servers, NAS, routers, and DVRs without compromising airflow.
- • **Whisper-Quiet Power:** Experience premium cooling with noise levels as low as 14.9 dB(A), perfect for focused workspaces and 24/7 operation.
- • **Precision PWM Control:** 4-pin PWM interface enables seamless automatic speed adjustments, balancing performance and energy efficiency effortlessly.
- • **Complete Installation Kit:** Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for hassle-free, vibration-free integration into your setup.
- • **Award-Winning Aerodynamics:** Flow Acceleration Channels and Acoustic Optimisation frame deliver superior airflow and reduced turbulence for next-level cooling.

## Overview

The Noctua NF-A4x20 PWM is a high-performance, ultra-quiet 40mm fan engineered for professional-grade cooling in compact devices. Featuring a 4-pin PWM connector for dynamic speed control up to 5000 RPM, it combines advanced aerodynamic design with exceptional reliability (>150,000 hours MTTF). Ideal for 1U servers, network equipment, and other space-constrained applications, it ensures efficient airflow at minimal noise, backed by a 6-year warranty.

## Description

Premium quiet 40x20mm fan with advanced aerodynamic design for superior cooling performance. Features 4-pin PWM control for automatic speed adjustment.

## Features

- Premium quiet fan, 40x40x20 mm, 12V, 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 1U servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
- 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor)
- Includes anti-vibration mounts, fan screws, extension cable, y-cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07125KWG1 |
| Air Flow Capacity | 9.4 Cubic Metres Per Hour |
| Best Sellers Rank | 4,266 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 40 in Thermal Management Products 95 in Fans & Cooling |
| Brand | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | forced air |
| Country Of Origin | China |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,647) |
| Global Trade Identification Number | 09010018100105 |
| Item Dimensions L x W x H | 40L x 40W x 20H millimetres |
| Item Weight | 20 Grams |
| Manufacturer | Noctua |
| Manufacturer Part Number | NF-A4x20 PWM |
| Material | Fibre-glass reinforced PBT |
| Max Rotational Speed | 5000 RPM |
| Model Number | NF-A4x20 PWM |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Connector Type | 4-Pin |
| Product Warranty | 6 year manufacturer’s warranty |
| Unit Count | 1.0 count |
| Voltage | 12 Volts |

## Product Details

- **Air flow capacity:** 9.4 Cubic Metres Per Hour
- **Brand:** Noctua
- **Compatible devices:** Desktop
- **Cooling method:** forced air
- **Material:** Fibre-glass reinforced PBT
- **Maximum rotational speed:** 5000 RPM
- **Noise level:** 14.9 Decibels
- **Power connector type:** 4-Pin
- **Product dimensions:** 40L x 40W x 20H millimetres
- **Voltage:** 12 Volts

## Images

![NF-A4x20 PWM, High-Performance Quiet Fan 40mm | High Airflow Low Noise 20mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 5000rpm 4-Pin PWM - 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 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)
- Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)
- Noctua NF-A8 PWM, Premium Quiet Fan, 4-Pin (80mm, Brown)

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**Shop now:** [https://www.desertcart.hr/products/51055796-nf-a4x20-pwm-high-performance-quiet-fan-40mm-high-airflow](https://www.desertcart.hr/products/51055796-nf-a4x20-pwm-high-performance-quiet-fan-40mm-high-airflow)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-22*