used for 1 year at the top of the case. no problems with them whatsoever. upgraded to rgb fans and new pc case. the fans are cleaned to the best of my ability with isopropyl. you will receive 2 fans, all their attachments, fan screws, and original packaging in a tamper sealed box.

Model Silent Wings Pro 4 140mm PWM Dimensions (mm) 140 Color option Black Lighting - Fan speed at 100% PWM / 12V (rpm) 2400 Noise level at 100% PWM / 12V (dB(A)) 36.8 Airflow at 100% PWM / 12V (CFM / m3/h) 97.4 / 165.5 Air Pressure at 100% PWM / 12V (mm H2O) 3.64

Legendary silence, epic performance and features Silent Wings Pro 4 140mm PWM is the most progressive, performant and versatile fan by be quiet!

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 Individual mounting systems for use as a case fan or with a radiator 5-year manufacturer warranty

The fan blades are what makes a fan. It is for this reason that the fan blades of Silent Wings Pro 4 140mm PWM have been developed newly from scratch. The new blade arrangement enables a performance second to none for all possible operations. Be it in a case, on radiators or heat sinks.

Silent Wings Pro 4 140mm PWM makes for extraordinary air pressure and therefor, significantly increases the system’s performance. The decreased distance between the fan blades and the frame enables an extraordinarily high air pressure. By that, the Silent Wings Pro 4 140mm PWM allows the user to run even the most demanding applications.

The speed switch makes switching between medium, high-speed and ultra-high-speed of maximum RPM levels quick and easy. The Silent Wings Pro 4 140mm PWM alters its application with a simple slide to the right. Medium-speed is suitable for any operation that requires regular cooling performance. High-speed lets the fan spin faster, providing more cooling power. Ultra-high-speed ultimately offers enough rpm to cool even the most demanding hardware in high-end PC builds.

6-pole fan motor with 3 phases for very low power consumption, less vibration and therefore quiet max. operation of 36.8dB(A). Equipped with this state-of-the-art technology the fan is virtually inaudible when operated in mid-speed.

Silent Wings Pro 4 140mm PWM has 3 mounting options in the scope of delivery. The pre-installed radiator corners are specially designed for radiators on which the incomparable performance of this high-end fan completely shines. On the other hand, for chassis use, the anti-vibration mounting is the first choice as they reduce vibrations to a minimum. The plastic mountings round up the scope.

The advanced fluid-dynamic bearing (FDB) enables a super long fan life of up to 300,000 hours. In addition, it reduces the vibrations significantly and supports the virtually inaudible operation of Silent Wings Pro 4 140mm PWM.

The all-black design combined with a high-grade fan sticker makes Silent Wings Pro 4 140mm PWM a highlight in any system. The finely sleeved PWM cable perfectly rounds up the outer appearance of the fan. Not only does the PWM cable look great: its connector can also be plugged in and out with ease, making the fan an eye-catcher and user-friendly alike.