Outstanding Reliability And Silent Cooling The Pure Wings 2 family fans are unique in their class, combining outstanding reliability, silent cooling, and a great price-for-performance ratio. It's impressive how much quiet technology the German engineering team has crammed into these fans at this amazing price. They are the ultimate reason to put well-known be quiet! silent cooling in your PC if you haven't already done so. The Pure Wings 2 120mm PWM model combines all of the above essential features. It provides maximum cooling airflow and operating noise levels down to a silent 20.2dB(A). The increased air pressure makes the fans especially recommended for use in water cooling and air cooling setups.