be quiet! Fan 140mm - SILENT WINGS 4 140mm PWM high-speed

be quiet! SILENT WINGS 4 140mm PWM high-speed is a 140mm fan, aimed at more serious gaming and enthusiast configurations, where you seek a balance between airflow and noise. It operates as a PWM fan with a high maximum speed, so it can be quiet in idle and aggressive under load. The combination of 400–1900 RPM, 6-pole motor, and fluid-dynamic bearing is designed for smooth operation with minimal vibrations. The black design is clean and easily fits into any build without any lighting "circus".

What you get

With the 140 x 140 x 25 mm format, you get a fan that covers a larger area than a 120mm one, which is a plus for radiators and large coolers. The range from 400 RPM to 1900 RPM gives you a lot of flexibility – you can set aggressive curves for airflow during gaming and near-silent operation under low load. The 6-pole motor and dynamic fluid bearing reduce vibrations and contribute to smoother rotation and less noise over time. The declared lifespan of up to 300,000 hours MTBF means that this fan is planned for long-term operation in 24/7 machines, without you having to think about quick replacement. The specially optimized blades and frame with "funnels" at the outlet help achieve high static pressure – key if you will use it on a radiator or a dense dust filter.

• The 140 x 140 x 25 mm format provides greater airflow compared to standard 120mm fans at similar speeds.
• The wide range from 400 RPM to 1900 RPM allows for both very quiet operation in idle and strong airflow under load.
• The 6-pole motor and fluid-dynamic bearing reduce vibrations and ensure smoother and more stable operation over time.
• The officially announced lifespan of up to 300,000 hours MTBF is indicative of a long life, suitable for 24/7 systems.
• The optimized blades and frame with funnel-shaped air outlets are designed for very high static pressure on radiators and heat sinks.
• Vibration-damping mounting with push pins and a screwing option gives you flexibility in how to attach it to the case or radiator.
• The 4-pin PWM connector at 12 V and consumption of up to 4.8 W allow for precise control of speeds via the motherboard or a fan controller.

Who it is suitable for

It is suitable if you are building a gaming or workstation machine with a focus on quiet mode and want a fan that works well on radiators or massive air coolers. It is also very sensible for cases with dense front panels and filters, where high static pressure is important. If you are looking for a cheap fan or mandatory RGB lighting, this is not the right choice.

The strongest combination here is the flexible RPM range, high static pressure, and very long lifespan, which makes this fan a stable long-term foundation for a quiet and well-cooled build.