PROCOOL SL440B / 1U Rack Mount Intake Fan/Blue LED fans/DJ, Amp and Equipment racks/IT/Network Server racks/Data Center Cooling 1U One rack space - 19" x 1.75" x 2" 4 SL40B blue LED fans Airflow = 42 CFM (INTAKE) Noise = 38 dBA 2 Year Warranty - Built by hand in the USA