Hey greenthing

It's a combination of things that make a fan noisy, if it's touching anything hard that it can vibrate through can add to the noise, a lot of bends in your ducting dosn't help either. You can buy silencers, acoustic ducting and fan controllers which all reduce noise.
hudson88 Reviewed by hudson88 on . Fan noise I have a four inch intake fan and its a bit noisy how can i silence it, would it be safe to put it into a box of some sort or would that make it overheat.:) Or is it the air coming in through air ducting making the noise. :( Rating: 5