Usual when cable hits fan when it is spinning?
Easy way find out what fan it is. Stop one fan at time for second or two with your finger. Then make cable go that way it can not hit the fan. If it is something else. Well we figure out how to do it so that noise will not bother anymore
Good fans are 120mm Scythe gentle typhoon 1150rpm.
140mm Noise Blocker PRO. (if you want new fans)
cheap way to slow fan speed is zallman fan mate 2