The Pure Wings 2 140mm PWM high-speed fan offers excellent be quiet! Cooling in the entry-level class. The extremely high air pressure makes it the perfect choice for any system. Pure Wings 2 high-speed fans offer the highest level of reliability and excellent cooling with a virtually unbeatable price-performance ratio. Nine air flow optimized fan blades to reduce noise-causing air turbulence The durable rifle bearing provides an operating life of 80, 000 hours Even at maximum speed, the fan reaches only 37. 3 dB (A) Product concept, design and quality control in Germany Three years manufacturer's Air flow optimized fan blades For a perfect cooling. The fan blade surfaces are optimized to increase airflow and air pressure while reducing noise-causing turbulence. The recipe for effective cooling of Pure Wings 2 fans. The Pure Wings 2 140mm PWM high-speed fan is at maximum capacity only at 37. 3dB (A). Variable fan speed Volume and fan speed can be controlled by the pulse width modulation (PWM) via 4-pin fan controller. No matter if a maximum cooling capacity is required or rather a minimum volume. Both can be adjusted as needed. Rifle bearing technology The Pure Wings 2 140mm PWM high-speed fan stands for a very reliable operation and promises a very long life of up to 80, 000 hours. Technical Details Dimensions: 140mm Revolutions at 100% PWM / 12V (rpm): 1600 Air flow @ 100% PWM / 12V (cfm / m3 / h): 94. 2 / 160 Air pressure @ 100% PWM / 12V (mm H2O): 1. 82 Volume at 100% PWM / 12V (dB (A)): 37. 3