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jjwild_gw

High-pitched buzzing/humming noise from above

JJWild
11 years ago

I've been hearing some high-pitched buzzing/humming coming from my upstairs neighbors' unit.

When it ends, it is followed by a loud bang. Before it starts I hear some fan or rotor blades shrieking.

The buzzing/humming sounds lasts for several minutes. It seems to come on at some regular intervals. It starts only around 9 p.m. every night.

I had approached my neighbors before about this noise but they pretend to not know about it.

Does anyone have any idea what could be causing it?

Thanks.

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