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White 120mm case fan with nine blades and smooth frame

be quiet!

be quiet! BL115 Silent Wings 4 120mm PWM 2500 RPM White case fan

SKU CH-9FPW-00HHC MPN BL115

A 120 mm PWM case fan with fluid-dynamic bearing spins up to 2500 RPM, delivering 75-80 CFM airflow at 31.2 dBA and rated for 300000 hours

  • Fan size120 mm
  • Number of fans1 Fan
  • Bearing designFluid Dynamic Bearing
  • Rotational speed2,500 RPM
  • Airflow rate75-80 CFM
  • Operating noise31.2 dBA at max RPM

Model 120mm PWM high-speed

Color White

  • High static pressure from funnel frame and tight tip clearance
  • Quiet 31.2 dBA at full 2500 RPM speed
  • Strong 75-80 CFM airflow for radiators and heatsinks
  • Smooth, low-vibration running via 6-pole motor and fluid-dynamic bearing
  • Flexible mounting with anti-vibration push pins and screw option

120mm PWM high-speed case fan

The be quiet! Silent Wings 4 BL115 is a single 120mm case fan built for users who want strong airflow with very low noise. Its fluid-dynamic bearing and 6-pole motor deliver smooth operation at speeds up to 2500 RPM. The all-white, non-LED design suits clean, light-themed builds.

Fits standard 120mm mounts

The fan uses a standard 4-pin PWM connector for automatic speed control via motherboard headers. Anti-vibration mounts are included for both push-pin and screwed installation, reducing resonance transfer to the chassis. The funnel-shaped frame outlets and minimal tip clearance make it effective on radiators and dense heat sinks where static pressure matters.

Delivers 75-80 CFM at 31.2 dBA maximum noise

At full speed the fan moves 75 to 80 CFM while peaking at 31.2 dBA, leaving headroom for quiet operation under typical loads. The design targets high static pressure, so it handles restrictive radiators and heatsink fins comfortably. It is not suited for builds needing RGB illumination or airflow above 80 CFM.

How it compares

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

Price $21.99
Pricier than about 55% of the 8,339 comparable items (median $19.99).
Fan size 120 mm
Typical for this category: the median of 1,114 items is 120 mm.

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Specifications

Product
Brand namebe quiet!
Product typeCase Fan
Product colorWhite
Performance
Rotational speed2,500 RPM
Airflow rate75-80 CFM
Power
Power input connector4-pin PWM
Size & build
Fan size120 mm
Number of fans1 Fan
Bearing designFluid Dynamic Bearing
Shipping weight0.45 kg
Package size203 × 140 × 38 mm
Environment & compliance
Operating noise31.2 dBA at max RPM
More details
LED lightingNon-LED

Other versions of this model

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Questions about this item

At what point does the 2500 RPM motor hit its airflow ceiling under sustained load?

The fan delivers 75-80 CFM at its maximum 2500 RPM, so sustained airflow tops out in that range.

How loud and hot does the fluid-dynamic bearing get when the fan runs at 2500 RPM all day?

Noise is rated at 31.2 dBA at max speed; the 6-pole motor and fluid-dynamic bearing are designed for low vibration and smooth long-term operation.

What motherboard header must I already have to control this 4-pin PWM fan?

A standard 4-pin PWM header is required for speed control and monitoring.

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