REVERSED AIRFLOW: Special design that draws in air from the back side. Ideal for glass fronted designs and PC builds where conventional fans would spoil the appearance HIGH STATIC PRESSURE: Efficient even with resistance the generated airflow easily penetrates dense radiators, narrow perforated panels and mesh structures and ensures reliable cooling PWM CONTROL WITH WIDE SPEED RANGE: The speed can be progressively adjusted up to 2650 rpm via the 4-pin PWM connection the fan stops completely at less than 5% PWM PRECISE MANUFACTURING FOR MAXIMUM SMOOTH RUNNING: Minimal gaps, automatic balancing and high-precision measurement noticeably reduce vibrations for quiet, efficient and long-lasting performance SMOOTH-RUNNING FLUID DYNAMIC BEARING (FDB): The self-lubricating bearing minimizes noise during operation ideal for quiet, efficient cooling and a long, reliable service life