Product DescriptionThis new double ball-bearing case fan delivers superior performance that keeps power usage and noise level at it's lowest! Dual ball-bearing case fans ensure extended life and optimal system operation. Durably designed. Precision engineered. Rigorously tested to exceed ordinary quality control standards. Static Pressure - 3.72 mm/H2O Bearing Type - Dual Ball Bearing system Noise - 28.6 dB(a) Adapter - 3 to 4 Pin