Proper PWM controlled fans at sufficiently low speed are inaudible. Apart from the ones in my bathroom which run on full blast to give 23-24°C, I can hear none of my 120 or 140 mm fans. Have a look at my project here:
Proper PWM controlled fans at sufficiently low speed are inaudible. Apart from the ones in my bathroom which run on full blast to give 23-24°C, I can hear none of my 120 or 140 mm fans. Have a look at my project here: