This is of no use to you at all, because I am in UK, and you could be in Outer Mongolia for all I know. "Frank" does not give a clue to your location.?
Take it out, clean it, and put it back in with a bit of thin foam over it.?
The fans are generally noisy due to what the air is hitting, not the fan itself. If it is the fan, clean or replace. 40mm x 40mm.?