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A comment on What is the mysterious 'global Hum' and is it simply noise pollution? (2019). Parent comment

Re:What is the mysterious 'global Hum' and is it simply nois... by DoofusOfDeath on Sunday October 11, 2020 @11:19AM (#24746362)
I wonder if fans with (not a power of 2) blades could also generate surprising tonal (i.e., not transient) frequencies.

I could imagine this logic also applying to other pumps in the house: AC pumps, baseboard heat circulators, sump pumps, etc.

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