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be quiet! Silent Wings 4 Pro 140mm PWM Chassis Fan

be quiet! Silent Wings 4 Pro 140mm PWM Chassis Fan

CCL Code: CLR2521

£29.30 inc VAT

be quiet! Silent Wings 4 Pro 140mm PWM Chassis Fan


£29.30 inc VAT

Available for delivery from Tomorrow

Order within

Buying in bulk? Contact our business team.

Key Features:

Silent Wings Pro 4 140mm PWM is the most progressive, performant and versatile fan by be quiet!

CCL Code: CLR2521


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. 


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. 


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. 


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.


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.


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.


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.

Main Features

  • 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


Fan Speed Up to 2400 RPM
Air Flow Up to 97.41 CFM
Bearing Type FDB
Connector 4-pin PWM
Fan Air Pressure Up to 3.64 mmH2O
Lifetime Up to 300,000 hours


Voltage 7 ~ 13.2 V
Current 0.5 A


Noise Level Up to 36.8 dBA


Form Factor Chassis Fan
Case Colour Black
Cable length 500 mm
In The Box Chassis Fan
4 x Screws
4 x Push Pins
Fan Width cm
Fan Depth 140 mm
Fan Height 25 mm
Fan Weight 0.258 kg


Warranty 5 Years

Key Features

Main Colour Black
Internal/External Use
Number of Speeds
Fan Diameter
Fan Size 140 mm
Display Model in Showroom
L.E.D Fan No LED
Number of Fans fan(s)
LED Controller Included
LED Strip(s) Included
Fan Connector 4-pin PWM

Item Details

Manufacturer Be Quiet!
Manufacturer Code BL099
EAN 4260052188910
Condition New

Warranty Information

Warranty 5 Years

Manufacturer Information

Manufacturer Be Quiet!
Manufacturer Code BL099

Do you have you a question about the be quiet! Silent Wings 4 Pro 140mm PWM Chassis Fan?

4.7 / 5 3 reviews


last month

Expensive for a case-fan, but quality and performance are excellent.


last month

3 speeds configurable by a switch, quite silent and very powerful, the real only inconvenient is the price.


3 months ago

This is the quietest fan i've ever used. My system even under load is so quiet that I had to check they were working after installing them. I do think there expensive for what they are. After all its just a fan. When compared to other fans though it is a reasonable price.