Silverstone Tek Air Penetrator 180 X 180 X 32mm / 500rpm ~ 2000rpm Air Channeling Cooling Case Fan AP182, White Industry leading air channeling fan Wide fan blades for reducing air resistance Integrated air channeling grille double as fan guard to reduce overall size Wide 500rpm ~ 2000rpm speed range with analog control Exceptional airflow and airflow range comparable to household fans Dual ball bearing for long lifetime