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Black 140mm PWM case fan with square frame and fluid dynamic bearing

be quiet!

be quiet! BL099 Silent Wings Pro 4 140mm PWM case fan

SKU CH-S5V3-HVMNT MPN BL099

140 mm PWM case fan with a speed switch offering three maximum RPM settings up to 2400 rpm, fluid-dynamic bearing, and 97–165 CFM airflow at 35–40 dBA

  • Fan Counts1 Fan
  • Fan ControllerNo Controller
  • TypeCase Fan
  • CompatibilityCase
  • Fan Size140mm
  • Fan Thickness25mm

Option 140mm PWM

Struck-through versions exist but are not stocked here.

Color Black

  • Black
  • White

Struck-through versions exist but are not stocked here.

  • Optimized blades deliver up to 165 CFM airflow for radiator cooling
  • Three-position speed switch selects 1100, 1900 or 2400 RPM maximum
  • 6-pole motor with fluid-dynamic bearing cuts vibration and power draw
  • Funnel-shaped frame and tight tip clearance create high static pressure
  • Runs at 35-40 dBA for virtually silent operation at normal speeds

140 mm PWM fan for radiators and cases

The be quiet! BL099 Silent Wings Pro 4 is a single 140 mm case fan built for high static pressure on radiators and heat sinks. Its fluid-dynamic bearing and six-pole motor reduce vibration while delivering up to 165 CFM airflow. The all-black frame suits clean, performance-focused builds.

Check 4-pin header and 25 mm mounting depth

Verify that your motherboard or fan controller provides a standard 4-pin PWM header for speed control. The frame measures 25 mm thick, so confirm clearance around the mounting holes for either case or radiator installation. A physical speed switch on the fan housing lets you cap the maximum RPM at three preset levels.

35 to 40 dBA at 2400 RPM maximum

At the ultra-high speed setting the fan reaches 2400 RPM with a noise output of 35 to 40 dBA. Medium and high presets limit the motor to 1100 RPM and 1900 RPM respectively for quieter operation. The funnel-shaped outlet and tight tip clearance maintain pressure while keeping acoustic signature low under typical loads.

Highlights

  • Optimized blades deliver up to 165 CFM airflow for radiator cooling
  • Three-position speed switch selects 1100, 1900 or 2400 RPM maximum
  • 6-pole motor with fluid-dynamic bearing cuts vibration and power draw
  • Funnel-shaped frame and tight tip clearance create high static pressure
  • Runs at 35-40 dBA for virtually silent operation at normal speeds

Specifications

Brandbe quiet!
SeriesSILENT WINGS PRO 4
ModelBL099
Fan Counts1 Fan
Fan ControllerNo Controller
TypeCase Fan
CompatibilityCase
Fan Size140mm
Fan Thickness25mm
Bearing TypeFluid Dynamic
RPM2000-2499 RPM
Air Flow97-165 CFM
Noise Level35 - 40 dBA
Power Connector4 Pin
ColorBlack
Shipping weight0.45 kg
Package size203 × 165 × 32 mm

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Questions about this item

Does the box include mounting hardware for both case and radiator installation, or do I need to buy extra brackets?

The fan ships with individual mounting systems for case and radiator use, so no separate brackets are required.

Should I choose the medium, high or ultra-high speed setting for a typical CPU cooler radiator?

The speed switch lets you set the maximum PWM limit to 1100, 1900 or 2400 rpm; pick the profile that matches your cooling curve and noise tolerance.

What does the 97 to 165 CFM range mean when the fan is mounted on a dense radiator?

At the ultra-high 2400 rpm setting the fan delivers up to 165 CFM, while the medium 1100 rpm setting drops to 97 CFM for quieter operation.

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