% £-31.95
Be Quiet! (BL099) Silent Wings Pro 4 14cm PWM Case Fan, Black, Up to 2400 RPM, 3x Speed Switch, Fluid Dynamic Bearing
Be Quiet! (BL099) Silent Wings Pro 4 14cm PWM Case Fan, Black, Up to 2400 RPM, 3x Speed Switch, Fluid Dynamic Bearing
Be Quiet! (BL099) Silent Wings Pro 4 14cm PWM Case Fan, Black, Up to 2400 RPM, 3x Speed Switch, Fluid Dynamic Bearing
Be Quiet! (BL099) Silent Wings Pro 4 14cm PWM Case Fan, Black, Up to 2400 RPM, 3x Speed Switch, Fluid Dynamic Bearing
BEQUIET

Be Quiet! (BL099) Silent Wings Pro 4 14cm PWM Case Fan, Black, Up to 2400 RPM, 3x Speed Switch, Fluid Dynamic Bearing

Product SKU: CF140-BQSILPRO4-PWM
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Silent Wings Pro 4 140mm PWM is the most progressive, performant and versatile fan by be quiet!

 
  • Optimized fan blades for the highest performance on radiators and heat sinks
  • Speed switch allows changing maximum PWM speed between medium-speed, high-speed and ultra-high-speed (up to 2400 rpm)
  • Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressure
  • Virtually inaudible operation at regular speed
  • 6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations
  • Individual mounting systems for use as a case fan or with a radiator
  • 5-year manufacturer warranty





Improved On All Levels
 
Altered blade arrangement for new generation performance
 
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.
 
 


 
Optimized For High-End Performance
 
Minimum distance for maximum air pressure
 
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
 
3 speed options for any possible application
 
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
 
The key for virtually inaudible operation when needed
 
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
 
For any purpose
 
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
 
For a sustainable operation
 
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.
 
 
 
 
 
Elegant Look
 
Magnificent appearance in all details
 
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.
 

 

Description

Specification

  • Type: 140mm Case Fan
  • Fan Connector(s): 4-pin
  • Fan Controller: PWM
  • #Hide#Max RPM: 2400 RPM
  • Rotation Speed: "Up to 2400 RPM

    Speed Switch offers 3 speed options:
    medium-speed, high-speed and ultra-high-speed"
  • Fan Bearing: Fluid Dynamic
  • Air Flow: 97.41 CFM @ 100% PWM / 12V
  • Installation: Push pins and screwed installation options
  • #Hide#LED Lighting: No
  • Colour: Black
  • LED Lighting: -
  • Dimensions: 140 x 140 x 25 mm
  • Weight: 0.258 kg
  • Noise level: 36.8 dB(A) @ 100% PWM / 12V
  • Power: Rated Voltage DC: 12 V
    Operating Voltage DC: 7 - 13.2 V
    Current consumption: 0.50 A
    Safety current: 0.50 A
    Input power: 6.0 W
  • Additional Features: See Overview / Video
  • MTBF: "Up to 300,000 hours"
  • Package Contents: Silent Wings Pro 4 fan
    Radiator optimized fan corners
    Rubber and hard plastic mountings
    Push-pins
    Fan screws
    Manual
  • Package Type: Retail
  • Package Weight: 0.4600 kg
  • Warranty: 5 Years
  • #Hide#Colour: Black

Delivery & Shipping Policy

Last updated: 19/09/2025

At Tech Direct UK, we aim to get your order to you as quickly and efficiently as possible. Please see below for our delivery terms.

1. Delivery Options & Costs

  • Free Delivery – Orders over £50 qualify for free UK standard delivery.

  • Standard Delivery – Orders under £50 are charged at £4.99.

2. Delivery Times

  • Next Day Delivery – The majority of items are shipped via next day courier if ordered before 2:00pm (Monday–Friday).

  • Orders placed after 2:00pm, on weekends, or bank holidays will be processed the next working day.

  • Larger or Heavy Items – Certain products (e.g., heavy furniture, oversized goods) may take 2–5 working days for delivery. Estimated times will be displayed at checkout.

3. Delivery Areas

  • We deliver to all mainland UK addresses.

  • Deliveries to remote areas (e.g., Highlands, Islands, Northern Ireland) may take longer or incur additional charges — these will be shown at checkout before confirming your order.

4. Tracking Your Order

  • Once dispatched, you will receive an email confirmation with tracking details (where available).

  • You can track your delivery via the courier’s website.

5. Missed Deliveries

  • If you are not available at the time of delivery, the courier will leave a card or attempt redelivery.

  • Repeated failed delivery attempts may result in the parcel being returned to us. In this case, re-delivery charges may apply.

6. Risk of Loss

  • Risk of loss or damage to the goods passes to you once they are delivered.

  • Please inspect your order upon receipt and notify us of any issues within 48 hours.

7. Contact Us

If you have any questions about delivery, please contact us:
📧 Email: support@techdirectuk.com

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