Replaced a ceiling mounted one that made the plasterboard vibrate with an inline fan. The inline fan is up in the attic and ducts through the roof. The new fan extracts 3x as much air and is much quieter.
Still need to make good the ceiling, but that’s tomorrow*'s job.
*Tomorrow in this case may not actually be tomorrow.
Hope you used a class 1 decibel-o-meter. 15 is a lot.
My high tech smartphone sound meter read 65dB yesterday and 50 today. That’s scientific enough for me.