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how do I get rid of a very high pitch sound when the vacuum cleaner is on?

The vacumm works fine, but it has a very high pitch sound when it is on. What can I do to stop this noise?
Cindy, October 2011
I don't think you can. We have one and it makes a high pitched whistle while it's working.

The problem is that its moving a lot of air, very quickly and that is bound to make a lot of noise.

Clarence, October 2011