This superb PC case fan might not have any fancy RGB lighting, but it offers great cooling performance while making very little noise.
be quiet! Silent Wings Pro 4 in test - fan for all cases?
SILENT WINGS PRO 4 140mm PWM silent high-end Fans from be quiet!
be quiet! Silent Wings Pro 4 120 mm PWM Fan Review
be quiet! Launches Silent Wings 4 and Silent Wings Pro 4 Fan Series
be quiet! Silent Wings 4/Silent Wings Pro 4 120mm Review - eTeknix
How to burn your money - but in BIG - be quiet! Silent Wings 4 PWM
be quiet! Silent Wings Pro 4
No compromise silence and performance Silent Wings 4 140mm PWM high-speed combines all features of a virtually inaudible with an extremely performant fan. A 6-pol-motor and anti-vibration mountings combined with fan blades optimized for maximum airflow make Silent Wings 4 140mm PWM high-speed the perfect choice for the most demanding applications in high-end systems.
be quiet! Silent Wings 4 - Case fan - PWM high-speed - 140 mm - black
be quiet! Silent Wings 140 PWM Review
Silent wings 4 pro 140mm review : r/hardware