80mm 12V Brushless DC Cooling Fan 80x80x25.4mm Medium Speed Sleeve Bearing Dynatron (Top Motor) DF1208SM or DF128025SM 80-mm ( 8-cm ) System Fan FN-8025-3P-SM-DY Size: 80x80x25.4mm Bearing System: Sleeve Bearing Rated Voltage: 12V Speed: 2600 +/- 10% RPM Air Flow: 27.94 CFM Static Pressure: 2.47 mm-H2O Noise Level: 30.10 dBA click here for Dynatron / Top-Motor Item Numbers Comparison Chart