Heat is the biggest danger to your high-powered systems today. The Masscool SL-FD14025 140mm Silent Case Fan is a more efficient cooling fan that can protect your PCs vital parts and boost performance. Keep your systems cool with the Masscool SL-FD14025 140mm Silent Case Fan. The Masscool SL-FD14025 140mm Silent Case Fan cools efficiently and stylishly. Super Silent fan PWM function 2 Ball Bearings Fan Guard 140mm Fan