Article number: BL099


140mm PWM

Legendary silence, epic performance and features

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
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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.

“Silent Wings Pro 4 without a doubt are the very best fans be quiet! has ever built. Their performance is undisputed, their versatility unparalleled and their technology unreached.” 

Marius Sabisz, Head of BU Cooling

All models at a glance:

Product Series

General data

ModelSilent Wings Pro 4 140mm PWM
Dimensions (mm)140
Color optionBlack
Fan speed at 100% PWM / 12V (rpm)2400
Noise level at 100% PWM / 12V (dB(A))36.8
Airflow at 100% PWM / 12V (CFM / m3/h)97.4 / 165.5
Air Pressure at 100% PWM / 12V (mm H2O)3.64


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Mechanical specifications

Dimensions (L x W x H), (mm)140 x 140 x 25
Weight incl. fixed cables (g)258
Bearing technologyFDB
Motor technology6-pole fan motor
Push pin fixing
Screw fixing

Cables / Connectors

Daisy-chain compatible-
Lighting connector-
Connector4-pin PWM
Cable length (mm)500
Cable sleeve

Performance / Noise

Airflow at 100% PWM / 12V (CFM / m3/h)97.4 / 165.5
Air Pressure at 100% PWM / 12V (mm H2O)3.64
Noise level at 100% PWM / 12V (dB(A))36.8
Lifespan (h / 25°C)300,000
Zero RPM mode

Electrical specifications

Rated Voltage DC (V)12
Operating Voltage DC (V)7 - 13.2
Current consumption (A)0.50
Input current (A)0.50
Safety current (A)0.50
Input power (W)6.0
Rated Current LED (A)-


3-pin to 4-pin 12V-connector-
12V to 7V adapter-
12V to 5V adapter-
Push pins4
hard plastic washer4
OthersRubber & hard plastic & radiator mountings

Safety certification

ApprovalsCE / RoHS / RU / UKCA / TÜV / WEEE

Environmental directives



Warranty (Years)5
International hotline / free of charge✓ / DE, FR, US

Logistics data and RRP

Article numberBL099
EAN code4260052188910
Dimensions, package (L x W x H), (mm)206.5 x 156 x 31
Gross weight, package (kg)0.45
Pieces per packaging unit32
Dimensions, shipping box (L x W x H), (mm)463 x 317 x 388
Gross weight, shipping box (kg)15.54
RRP (€)32.90

Article number: BL099

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