Zalman's new SF series of case fans feature Shark-fin blades that help reduce noise and vibrations while increasing airflow. They also feature silicone anti-vibration fan mounts.
Korean cooling company Zalman are world-famous in their field, and the Zalman ZM-F2 Plus SF shows that they can produce good quality, simple and inexpensive cooling fans. The F2 is Zalman's 92mm quiet case fan which comes with silicone anti-vibration mounting pins which significantly dampen low-frequency vibrations from the fan which would otherwise be transmitted into the PC case and be amplified.
The new SF series feature Shark-fin blades that greatly reduce turbulence caused by the fan rotation. This helps to reduce noise and vibration while increasing airflow.