---
product_id: 82236934
title: "Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)"
brand: "noctua"
price: "€ 36.90"
currency: EUR
in_stock: true
category: "Noctua"
url: https://www.desertcart.at/products/82236934-noctua-nf-a4x20-pwm-premium-quiet-fan-4-pin-40x20mm
store_origin: AT
region: Austria
---

# >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)

**Brand:** noctua
**Price:** € 36.90
**Availability:** ✅ In Stock

## Summary

> 🌀 Silence Meets Power: The Ultimate Compact Cooling Solution

## Quick Answers

- **What is this?** Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown) by noctua
- **How much does it cost?** € 36.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/82236934-noctua-nf-a4x20-pwm-premium-quiet-fan-4-pin-40x20mm)

## 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:** Engineered with fibre-glass reinforced PBT and backed by a 6-year warranty, ensuring durability and long-term peace of mind.
- • **Compact Yet Mighty:** Designed at 40x40x20mm, ideal for tight spaces like 1U servers, NAS, and network gear without compromising airflow.
- • **Whisper-Quiet Power:** Experience premium cooling with noise levels as low as 14.9 dB(A), perfect for focused workspaces and serene environments.
- • **Precision PWM Control:** 4-pin PWM interface enables seamless automatic speed adjustments, balancing performance and silence effortlessly.
- • **All-Inclusive Installation Kit:** Comes with anti-vibration mounts, extension cables, and OmniJoin adaptors for hassle-free, versatile setup.

## Overview

The Noctua NF-A4x20 PWM is a premium 40x40x20mm quiet fan designed for professional-grade cooling in compact devices like 1U servers and NAS. Featuring a max speed of 5000 RPM with ultra-low noise at 14.9 dB(A), advanced aerodynamic design, and a 4-pin PWM connector for smart speed control, it delivers reliable airflow of 9.4 m³/h. Built with durable materials and backed by a 6-year warranty, it includes a full accessory kit for easy installation and vibration-free operation.

## Description

Buy Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown): Case Fans - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## 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 | B071W93333 |
| Air Flow Capacity | 9.4 Cubic Meters Per Hour |
| Best Sellers Rank | #28 in Computer Case Fans |
| Brand | Noctua |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.8 out of 5 stars 2,064 Reviews |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.79"H |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x20 PWM |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Part Number | NF-A4x20 PWM |
| Power Connector Type | 4-Pin |
| Product Dimensions | 1.57"L x 1.57"W x 0.79"H |
| UPC | 841500110109 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |
| Warranty Description | 6 year manufacturer’s warranty |

## Product Details

- **Air Flow Capacity:** 9.4 Cubic Meters Per Hour
- **Brand:** Noctua
- **Compatible Devices:** Desktop
- **Cooling Method:** Air
- **Material:** Fibre-glass reinforced PBT
- **Maximum Rotational Speed:** 5000 RPM
- **Noise Level:** 14.9 Decibels
- **Power Connector Type:** 4-Pin
- **Product Dimensions:** 1.57"L x 1.57"W x 0.79"H
- **Voltage:** 12 Volts

## Images

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

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What is the CFM rating of this fan?**
A: 5.5 cfm

**Q: would anyone recommend this fan for a 3d printer hontend/part cooling fan?**
A: Yes, we'd recommend using this fan for your 3d printer. (Please note that this is a 12V DC fan.)

**Q: What is de difference between noctua nf-a4x20 pwm and noctua nf-a4x20 flx?**
A: one fan is pwm controllable (pwm), the other is not (flx).

PWM controlling: https://en.wikipedia.org/wiki/Computer_fan_control

**Q: Is a 4-pin two Fan splitter included?**
A: yes

## Frequently Bought Together

- Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)
- Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)
- Noctua NF-A8 PWM, Premium Quiet Fan, 4-Pin (80mm, Brown)

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**Shop now:** [https://www.desertcart.at/products/82236934-noctua-nf-a4x20-pwm-premium-quiet-fan-4-pin-40x20mm](https://www.desertcart.at/products/82236934-noctua-nf-a4x20-pwm-premium-quiet-fan-4-pin-40x20mm)

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-07-22*