My PC Fans Are Too Loud Can Anyone Help?????

I am currently in the vegging stage using my stealth grow box. My growth box has two 120 mm pc fans that can move out 48 cubic feet per meter and four 80mm pc fans that can move out 32.5 cubic feet per meter. The 120 mm fans barely make any noise. You cant hear them in the closet but when one or all of the 80 mm fans are plugged in it creates a vortex noise that almost everyone can hear. So, my question is does anyone know how to quiet down or make a 80 mm pc fan silent or close to it???????????????????

Use a dimmer switch to control their speed or a pc fan control unit

it's likely the brand and make of your fans bro... cuz it dont matter what size it is, they all come in quiet models

could be the vibrations the fans are making on the material they are attached to. try putting a buffer between the two like a piece of cardboard or something of the nature and see if that helps.

ya actually, he has a point, tighten whatever means by which it is fastened.

cubic feet per meter? that goes against everything our metric world has given us

its per minute yo