# be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099

- Category: Case Cooler
- Brand: be quiet!
- Model: BL099
- Part number: BL099
- Price (US): $29.90
- Price last checked: 2026-08-05
- Rating: 4.6/5 from 24 Amazon reviews
- Warranty: 1 year
- Product page: https://buildmypc.net/component-details/case-cooler/be-quiet-bl099/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | be quiet! |
| Model | BL099 |
| FAN RPM | 2400 RPM |
| Noise Level | 36.8 dBA |
| Airflow | 97.41 CFM |

## Key Features

- 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

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