repetitive background noise - mechanical malfunction?

Hi, this post is on behalf of a friend who has lived in her building for several years without any major issues. Recently she has started to hear a grinding/whirring background noise that goes on for about twenty seconds, followed by thumps (starts quietly at 0:05 in the link below, and the thumps are around 0:26-27). The sequence is repeating itself several times an hour and dozens if not a hundred times a day. The sound is new this year. Landlord is unresponsive. Any ideas of what it is? https://vocaroo.com/oBUBm0LLJhX?fbclid=IwAR3BLPHqxJqjAH3c3d8lPMyWDsF1XTOZZLV3-ifywbLRkM0pLut2HljTmtg

sixyearsandcounting

in General Discussion 5 years and 10 months ago

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mozeeatupu | 5 years and 10 months ago

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Garbage disposal? Toe kick or radiant heating? Roomba?

sixyearsandcounting | 5 years and 10 months ago

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“Is the apartment close to or adjoining a elevator shaft ?” – No. And it’s on the 3rd floor, so no garage door either.

mozeeatupu | 5 years and 10 months ago

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Sounds like a garage door

chinyere.ezie | 5 years and 10 months ago

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Is the apartment close to or adjoining a elevator shaft ?

sixyearsandcounting | 5 years and 10 months ago

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From above. They’ve talked to the people in the line above them but to no avail. Two floors up is a mostly-vacant corporate apartment, so it could be coming from there. It’s not constant like a fan – it goes on and off dozens of times during the day.

GreenThinker | 5 years and 10 months ago

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Is this sound coming from below or above her? Best just knock on the door and explain the situation, hopefully they get to the bottom of it. Could be a rotating fan, and the thump is it stopping and going back the other way?