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When I have a fan on in my room and its sound patterns change, is it just me or does the fan go faster and slower and have a rhythm?

I'm listening closely to the fan and it sounds like it changes rhythm.. like it makes different sounds..

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The electrical voltage being fed to your appliances can vary from 110 to 120 + or - a few volts. It could very well be affecting the rpm's of your fan blade to some small degree and your sensitive ears are picking that up.

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