Be Quiet! Silent Wings Pro 4 140mm PWM High-End Fluid-Dynamic Bearing PC Case & Radiator Fan with Speed Switch – BL099

Legendary Silence and Epic Performance Engineering

The be quiet! Silent Wings Pro 4 140mm PWM stands as the most progressive, performant, and versatile cooling fan ever crafted by be quiet! Designed from the ground up to conquer the most demanding computing environments, this elite-tier fan bridges the gap between absolute acoustic discretion and heavy-duty thermal capability. Whether deployed inside a restrictive chassis or forcing airflow through dense liquid-cooling radiators, it delivers unmatched performance without compromise.

Revolutionary Blade Architecture and Air Pressure

At the core of its formidable cooling power is a completely redesigned blade arrangement developed entirely from scratch. By minimizing the distance between the fan tips and the outer frame, combined with a funnel-shaped air outlet, the Silent Wings Pro 4 generates extraordinary static air pressure. This tight tolerance configuration ensures that air is driven forcefully and efficiently through high-resistance obstacles like radiator fins and thick heat sinks, empowering your system to sustain peak hardware clocks under heavy workloads.

Integrated Speed Switch for Ultimate Versatility

Adaptability is paramount for modern enthusiast builds, and the integrated speed switch makes customizing your cooling profile effortless. With a simple slide, users can toggle the maximum PWM speed range between medium-speed for balanced daily operations, high-speed for elevated gaming sessions, and ultra-high-speed reaching up to 2,400 RPM for extreme overclocking scenarios. This seamless multi-tier flexibility ensures your fan adapts instantly to whatever task your computer undertakes.

Advanced 6-Pole Motor and Fluid-Dynamic Bearing

Engineering excellence continues beneath the surface with a state-of-the-art 6-pole fan motor utilizing a 3-phase design. This modern architecture drastically cuts down electrical power consumption and dampens mechanical vibrations. Operating at regular or medium speeds, the fan remains virtually inaudible while capping peak noise at a well-controlled 36.8 dB(A) during ultra-high-speed operations. Coupled with an advanced fluid-dynamic bearing (FDB), internal friction is minimized to unlock a staggering, industry-leading operational lifespan of up to 300,000 hours.

Specialized Mounting Systems and Refined Aesthetics

Tailored installation is supported by three distinct mounting options included in the box. Users can utilize dedicated radiator corners optimized for liquid cooling setups, anti-vibration push-pin mountings for noise-free chassis installations, or standard plastic mountings. Visually striking with an all-black aesthetic, the fan features a finely sleeved PWM cable that enhances cable management and provides a clean, professional finish inside any glass-paneled window case.