Good points on the balancing, I did not ask what type of noise you are hearing. Try running the fan at different speeds, if it is out of balance, it will act differently at different speeds. Also, if it is a balance problem that has developed recently, check the screws holding the blades in place, if these loosen, the fan balance is usually affected.
Good luck.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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