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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 size140 mm
  • Number of fans1 Fan
  • Fan controlNo Controller
  • Fan depth25 mm
  • Bearing designFluid Dynamic
  • Rotational speed2000-2,499 RPM

Model 140mm PWM

Color Black

  • 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.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $27.99
Pricier than about 70% of the 8,339 comparable items (median $19.99).
Fan size 140 mm
Higher than about 80% of the 1,114 comparable items (median 120 mm).

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Specifications

Product
Brand namebe quiet!
Product lineSILENT WINGS PRO 4
Model nameBL099
Product typeCase Fan
Product colorBlack
Performance
Rotational speed2000-2,499 RPM
Airflow rate97-165 CFM
Power
Power input connector4 Pin
Size & build
Fan size140 mm
Number of fans1 Fan
Fan depth25 mm
Bearing designFluid Dynamic
Shipping weight0.45 kg
Package size203 × 165 × 32 mm
Compatibility
Compatible withCase
Environment & compliance
Operating noise35–40 dBA
More details
Fan controlNo Controller

Other versions of this model

3 more in the same range

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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