Hello, I am building a PC for gaming. The specifications are high end. I intent to sell it to my friend. Specs: CPU : core i7 6700 GPU : EVGA GeForce GTX 1080 FTW DT GAMING ACX 3.0 RAM : 32 GB G.Skill Ripjaws 4 Series DDR4 2400 PCU : EVGA Supernova 850 watt G2 80 Plus Gold I have spent heavy on it. I intend to assemble in rack mount case. I plan to custom build from metal fabrication service. I heard that cooling fans for racks are noisy. I need the advice to choose a medium range cooling fan which is less noisy . It needs to run like any normal PC.