2-Pack, Prolimatech Ultra Sleek Vortex 120mm Fan The 2-Pack includes two award winning Ultra Sleek Vortex 120mm PWM fans. Also sold individually and in 4-Packs on Amazon. Available in Black or White color. The Ultra Sleek Vortex 12 is a uniquely designed 17-blade desktop fan that is only 15mm thick! The slim design helps to reduce case clutter and can easily fit into tight spaces. An excellent solution for smaller desktop builds or for people who would like to free up space in their cases for components or better airflow. Moves 54 CFM of air while providing 0.9 mmH20 static pressure. The high airflow and static pressure allow the Ultra Sleek Vortex 12 to perform well as both case and radiator fans. A near silent operation of 7 to 17 dBa. Fan speed can be adjusted from 400 to 1300 RPM, allowing for flexibility in application and operation. The Ultra Sleek Vortex 12's high build quality, dual ball bearings, and sturdy frame guarantee a very long life and quiet operation.