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Did everybody get a takeaway shop's fan duct stuck to their wall like at my last rented flat?

It took me ages to understand why I was so stressed out until one evening I noticed things going peaceful all of a sudden. After that I became aware that the fan was running continuously from early morning to late evening, so I set to move out as soon as my term was over. Now I'm noticing that the building AC at the office is making the exact same low frequency, low amplitude hum when it's on and I get the exact same sensation of relief when it goes off.

Now, when I look at property, I also look for fan ducts on the walls. I also just realised that I should be looking for fan ducts inside walls if there's AC too...



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