I got a new fan this year early. Bracket broke on the old one last fall. New brackets are all metal, not plastic, but the new fans are very noisy. I asked mechanics if it needed greased or something, but said it would keep doing it anyway. The noise is very annoying to say the least, so I only turn it on when it's over 90. Basicly all this week. I can kinda tune it out while Im busy, but when I do shut it off, you really get a sense of how loud it is. My ears aren't ringing per say, just quite a relief to have it off.
In our center, a fan is like the grip strip tape on the steps. Just write it up and it will be done.