The Scythe Slip Stream SY1225SL12SL 120mm fan is extremely quiet and ideal for HTPC projects. At only 500 RPM, the Scythe Slip Stream"s airflow is 24.50 CFM at only 7.50 dBA! The nine blade fan is a great choice as a CPU Cooler fan on our popular Thermalright heatsinks or as a quiet case fan