---
product_id: 478823732
title: "Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing"
brand: "be quiet!"
price: "Bs.1141"
currency: BOB
in_stock: true
reviews_count: 13
category: "Be Quiet!"
url: https://www.desertcart.bo/products/478823732-silent-wings-pro-4-140mm-pwm-pc-case-fan-optimized
store_origin: BO
region: Bolivia
---

# 165.5 CFM airflow 36.8 dB(A) ultra-quiet max speed 6-pole motor, 3-phase tech Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing

**Brand:** be quiet!
**Price:** Bs.1141
**Availability:** ✅ In Stock

## Summary

> 💨 Silent Wings Pro 4: Where stealth cooling meets elite performance.

## Quick Answers

- **What is this?** Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing by be quiet!
- **How much does it cost?** Bs.1141 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/478823732-silent-wings-pro-4-140mm-pwm-pc-case-fan-optimized)

## Best For

- be quiet! enthusiasts

## Why This Product

- Trusted be quiet! brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Adaptive Speed Control:** Easy slide speed switch toggles between medium, high, and ultra-high RPM to match your cooling needs instantly.
- • **Vibration-Free Mounting:** Includes anti-vibration mounts and radiator corners for silent, stable installation in any setup.
- • **Endurance Meets Elegance:** Fluid-dynamic bearing ensures up to 300,000 hours lifespan with a sleek all-black design that complements your high-end build.
- • **Whisper-Quiet Powerhouse:** Virtually inaudible operation even at max 2400 RPM, letting you focus without distraction.
- • **Precision Airflow Engineering:** Optimized fan blades and reduced blade-to-frame gap deliver extraordinary air pressure for peak cooling.

## Overview

The be quiet! Silent Wings Pro 4 140mm PWM fan combines cutting-edge blade design, a 6-pole 3-phase motor, and fluid-dynamic bearing technology to deliver exceptional airflow of 165.5 CFM at whisper-quiet noise levels of 36.8 dB(A). Featuring a convenient speed switch for tailored cooling and multiple anti-vibration mounting options, it’s engineered for high-end PC builds demanding silent, reliable, and powerful thermal management.

## Description

From the manufacturer Legendary Silence, Epic Performance and Features Quiet and Performant Operation Improved on all Levels The fan blades are what makes a fan. It is for this reason that the fan blades of Silent Wings Pro 4 140mm PWM have been developed newly from scratch. The new blade arrangement enables a performance second to none for all possible operations. Be it in a case, on radiators or heat sinks. Optimised for High-End Performance Silent Wings Pro 4 140mm PWM makes for extraordinary air pressure and therefor, significantly increases the system’s performance. The decreased distance between the fan blades and the frame enables an extraordinarily high air pressure. By that, the Silent Wings Pro 4 140mm PWM allows the user to run even the most demanding applications. Speed Switch The speed switch makes switching between medium, high-speed and ultra-high-speed of maximum RPM levels quick and easy. The Silent Wings Pro 4 140mm PWM alters its application with a simple slide to the right. Medium-speed is suitable for any operation that requires regular cooling performance. High-speed lets the fan spin faster, providing more cooling power. Ultra-high-speed ultimately offers enough rpm to cool even the most demanding hardware in high-end PC builds. For any Purpose 6-Pole Fan Motor 6-pole fan motor with 3 phases for very low power consumption, less vibration and therefore quiet max. operation of 36.8dB(A). Equipped with this state-of-the-art technology the fan is virtually inaudible when operated in mid-speed. 3 Different Mounting Options Silent Wings Pro 4 140mm PWM has 3 mounting options in the scope of delivery. The pre-installed radiator corners are specially designed for radiators on which the incomparable performance of this high-end fan completely shines. On the other hand, for chassis use, the anti-vibration mounting is the first choice as they reduce vibrations to a minimum. The plastic mountings round up the scope. Fluid-Dynamic Bearing The advanced fluid-dynamic bearing (FDB) enables a super long fan life of up to 300,000 hours. In addition, it reduces the vibrations significantly and supports the virtually inaudible operation of Silent Wings Pro 4 140mm PWM. Magnificent Appearance in All Details Elegant Look The all-black design combined with a high-grade fan sticker makes Silent Wings Pro 4 140mm PWM a highlight in any system. The finely sleeved PWM cable perfectly rounds up the outer appearance of the fan. Not only does the PWM cable look great: its connector can also be plugged in and out with ease, making the fan an eye-catcher and user-friendly alike.

Review: Great product - Great product and quality, very silent but I needed a 3pin
Review: Super silent and soooo easy to install - A fan on my PC started to click, so I knew I had to change it. After a bit of research I found that these were the best option, they may not be the cheapest, but they're well made and are super silent. They arrived quickly (as an aside - great packaging). They were really easy to install, just four screws and a plug and I can honestly say I should've bought them years ago. They're totally silent and they've made working next to a whirring pc a dream. I can actually concentrate ! Couldn't be happier with the purchase, and although a bit more expensive, these will def last a long time. Highly recommended.

## Features

- The fan blades are what makes a fan. It is for this reason that the fan blades of Silent Wings Pro 4 140mm PWM have been developed newly from scratch. The new blade arrangement enables a performance second to none for all possible operations. Be it in a case, on radiators or heat sinks.
- Silent Wings Pro 4 140mm PWM makes for extraordinary air pressure and therefore, significantly increases the system’s performance. The decreased distance between the fan blades and the frame enables an extraordinarily high air pressure. By that, the Silent Wings Pro 4 140mm PWM allows the user to run even the most demanding applications.
- The speed switch makes switching between medium, high-speed and ultra-high-speed of maximum RPM levels quick and easy. The Silent Wings Pro 4 140mm PWM alters its application with a simple slide to the right. Medium-speed is suitable for any operation that requires regular cooling performance. High-speed lets the fan spin faster, providing more cooling power. Ultra-high-speed ultimately offers enough rpm to cool even the most demanding hardware in high-end PC builds.
- 6-pole fan motor with 3 phases for very low power consumption, less vibration and therefore quiet max. operation of 36.8dB(A). Equipped with this state-of-the-art technology the fan is virtually inaudible when operated in mid-speed.
- Silent Wings Pro 4 140mm PWM has 3 mounting options in the scope of delivery. The pre-installed radiator corners are specially designed for radiators on which the incomparable performance of this high-end fan completely shines. On the other hand, for chassis use, the anti-vibration mounting is the first choice as they reduce vibrations to a minimum. The plastic mountings round up the scope.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B74CP6X2 |
| Air Flow Capacity | 165.5 Cubic Feet Per Minute |
| Best Sellers Rank | 24,010 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 1,736 in Components & Replacement Parts |
| Brand | be quiet! |
| Compatible Devices | Radiator |
| Cooling Method | Air |
| Cooling method | Air |
| Country Of Origin | China |
| Customer Reviews | 4.7 out of 5 stars 900 Reviews |
| Global Trade Identification Number | 04260052188910 |
| Included Components | Case Fan, Manual |
| Item Dimensions L x W x H | 14L x 14W x 2.5H centimetres |
| Item Weight | 310 Grams |
| Manufacturer | be quiet! |
| Manufacturer Part Number | BL099 |
| Material | Polycarbonate |
| Max Rotational Speed | 2400 RPM |
| Model Number | BL099 |
| Noise Level | 36.8 Decibels |
| Number of Items | 32 |
| Power Connector Type | 4-Pin |
| Power connector type | 4-Pin |
| Product Warranty | China |
| Product dimensions | 14L x 14W x 2.5H centimetres |
| Set Name | PWM Pro-Version |
| Unit Count | 1.0 count |
| Voltage | 12 Volts |
| Wattage | 3.04 watts |

## Product Details

- **Brand:** be quiet!
- **Compatible devices:** Radiator
- **Cooling method:** Air
- **Material:** Polycarbonate
- **Maximum rotational speed:** 2400 RPM
- **Noise level:** 36.8 Decibels
- **Power connector type:** 4-Pin
- **Product dimensions:** 14L x 14W x 2.5H centimetres
- **Voltage:** 12 Volts
- **Wattage:** 3.04 watts

## Images

![Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing - Image 1](https://m.media-amazon.com/images/I/71oTv6qUmKL.jpg)
![Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing - Image 2](https://m.media-amazon.com/images/I/61Tf43y4uML.jpg)
![Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing - Image 3](https://m.media-amazon.com/images/I/619qBfL1udL.jpg)
![Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing - Image 4](https://m.media-amazon.com/images/I/7147vOX3SZL.jpg)
![Silent Wings Pro 4 140mm PWM PC Case Fan, Optimized Fan Blades, Extraordinary High Performance, Speed Switch for Changing Maximum PWM Speed, 6-Pole Fan Motor, Fluid-Dynamic Bearing - Image 5](https://m.media-amazon.com/images/I/61Gyv4oYt3L.jpg)

## Available Options

This product comes in different **Color, Set** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by S***H on 26 March 2026*

Great product and quality, very silent but I needed a 3pin

### ⭐⭐⭐⭐⭐ Super silent and soooo easy to install
*by M***T on 24 July 2023*

A fan on my PC started to click, so I knew I had to change it. After a bit of research I found that these were the best option, they may not be the cheapest, but they're well made and are super silent. They arrived quickly (as an aside - great packaging). They were really easy to install, just four screws and a plug and I can honestly say I should've bought them years ago. They're totally silent and they've made working next to a whirring pc a dream. I can actually concentrate ! Couldn't be happier with the purchase, and although a bit more expensive, these will def last a long time. Highly recommended.

### ⭐⭐⭐⭐⭐ silence is golden
*by D***Y on 31 July 2025*

if you want a quiet pc bequiet! I now have 4 14 cm fans and the bequiet 1000w psu. Total silence... no vibration

## Frequently Bought Together

- be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099
- be quiet! Silent Wings 4 Cooling Fan | 120mm PWM high-Speed | White | BL115

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-07-12*