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It will also overheat, as most have the motor in the airflow to cool the motor.FYI, a fan running and not moving air will over amp. Draw more power than when under proper load.
+1 on the noise issue. The squirrel cage itself can get incredibly loaded up. Remove the cage from the motor shaft and soak it. Sometimes you can get them clean with a simple stream of water (preferably hot) directed at the blades, making them spin. You won't believe how much you can get out of them, and they'll move much more air, with less noice, once clean.