Size of fan: 120x120x25 mm 4PIN is the number of fan leaves. Six heat pipes are used for heat dissipation. Air cooling KORT measures 122(L)*78(W)*154(H) mm. Voltage input: 12 VDC Spped Fan Rotation: 800-1800*10% RPM Maximum Fan Noise: 23.0 dBA Hydraulic bearing is the type of bearing. 73.4 CFM is the maximum air volume.