"Baron" wrote in message
...
Quite probably because the dust clinging to the blades and hub got blown
away. This probably would allow the fan to rotate a little more
quickly. There is no real reason other than normal wear for a fan to
be noisy.

It wasn't noisy until after the blades were spun overly fast by a blast of
air far stronger than the fan itself could ever create. This is especially
bad to do if the fan motor uses sleeve-type bearings rather than ball-type.

Jamming the fan blades in the way you describe is likely to do real
damage to the blades causing a major problem ! Definitely not to be
recommended.

I don't 'jam' anything. I simply prevent the blades from spinning.