80mm 12V Brushless DC Cooling Fan 80x80x20mm Low Speed Sleeve Bearing Dynatron (Top Motor) DF128020SL or DF1208SL 80x80x20 mm 80-mm ( 8-cm ) System Fan FN-8020-4P-SL-DY Size: 80x80x20mm Bearing System: Sleeve Bearing Rated Voltage: 12V Speed: 2200 +/- 10% RPM Air Flow: 21.50 CFM Noise Level: 23.00 dBA click here for Dynatron / Top-Motor Item Numbers Comparison Chart