A video showing a whining sound at this bathroom vent can reach 75 decibels helped to get our building’s management company to own the problem. The extraction fan is on the roof and should be silent in our home. The air is controlled by a motorized damper which makes no sound when open. Parts of the roof fan will be replaced. Over the years we’ve found this circa 1995 sound meter to be useful when addressing noise issues.
There’s an app for that wouldn’t cha know
Duh!🤦♂️(That’s a facepalm.)