80mm 12V Brushless DC Cooling Fan 80x80x20mm Medium Speed Sleeve Bearing Dynatron (Top Motor) DF128020SM or DF1208SM 80x80x20 mm 80-mm ( 8-cm ) System Fan FN-8020-2P3-SM-DY Size: 80x80x20mm Bearing System: Sleeve Bearing Rated Voltage: 12V Speed: 2600 +/- 10% RPM Air Flow: 28.00 CFM Noise Level: 29.50 dBA click here for Dynatron / Top-Motor Item Numbers Comparison Chart