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Three black 140mm PWM case fans with nine blades each, rifle bearing, 4-pin connectors

be quiet!

be quiet! BL138 Pure Wings 3 140mm PWM High-speed 3-Pack Case Fans

SKU CH-950M-MSX6M MPN BL138

Three 140 mm PWM case fans with rifle bearings and a closed-loop motor that maintains target speed up to 2.44 mm H₂O static pressure

  • Fan size140 mm
  • Bearing designRifle
  • Power input connector4-pin PWM
  • Number of fans3 Fans
  • Product typeCase Fan
  • Closed-loop motor maintains target RPM under resistance
  • Frame outlet redesign minimises air leaks for radiator efficiency
  • Optimised blade angle increases air pressure to 2.44mm/H2O
  • 9 airflow-optimised blades suit demanding water-cooled and air-cooled builds
  • Three 140mm PWM fans included for balanced case airflow

Three 140mm PWM fans in one pack

This three-pack supplies three be quiet! Pure Wings 3 140mm PWM case fans for builds that need balanced intake and exhaust. Each fan uses a 4-pin PWM connector for automatic speed control through the motherboard. The rifle bearing is designed for quiet, long-lasting operation.

Suited for radiators and restricted airflow

The closed-loop motor monitors actual rpm and compensates when resistance from a radiator or dense mesh slows the blades, keeping speed at the target value. A redesigned frame outlet reduces air leaks, and the nine optimised blades raise static pressure to 2.44mm/H2O. Builders who only need a single rear exhaust fan or who prefer a different bearing type should look at other options.

2.44mm/H2O static pressure

This pressure rating is the key figure for deciding whether the fans can push air through a water-cooling radiator or a restrictive filter. The high-speed PWM range and closed-loop control maintain that pressure across varying loads, making the kit a direct match for liquid-cooled and high-impedance air-cooled systems.

How it compares

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

Price $25.99
Pricier than about 65% 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 typeCase Fan
Power
Power input connector4-pin PWM
Size & build
Fan size140 mm
Bearing designRifle
Number of fans3 Fans
Shipping weight0.64 kg
Package size152 × 146 × 83 mm

Questions about this item

What does 2.44 mm H₂O static pressure mean for my build?

That pressure lets the fans push air through dense radiator fins or restrictive filters without slowing down, keeping liquid-cooled or heavily filtered systems cool.

How does the 4-pin PWM connector control the fans?

The motherboard sends a PWM signal to each fan, allowing precise speed curves from a low minimum up to the maximum RPM without voltage drops.

What clearance do three 140 mm fans need in my case?

Each fan is 140 mm square, so you need three mounting positions spaced for 140 mm fans — typically top, front or rear panels that support that size.

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