COUGAR 12CM Red LED Hydraulic (Liquid) Bearing Ultra Silent Fan 1200RPM 64.4CFM 16.6dBA # Cougar CFD12HBR Nine dual-layer rigid blades generate more powerful airflow, air pressure & decrease wind shear noise Innovative COUGAR diversion claws to provide focused airflow & reduce noisy air turbulences Reduce the vibrations efficiently & silent operation. HB runs more smoothly with no friction, make it quietly & durability Rubber fixed pins also reduces vibrations (fan run more quietly) and tool-less makes it easy to mount, with no tools required