PROCOOL SL480B-E / 2U Quiet Rack Mount Exhaust Fan/Blue LED Fans/DJ, Amp and Equipment racks/IT/Server racks/Data Center Cooling 2U 2 rack spaces - 19" x 3.5" x 2.5" 4 SL80B blue LED fans Airflow = 86.8 CFM (EXHAUST) Noise = 26 dBA 2 Year Warranty - Built by hand in the USA