So I was exploring my bathroom fan setup with the intention of sending a new wire through the wall to put the fan and light on separate switches. In the process, I noticed that there’s a white plastic cover over the part of the fan that should lead to duct work, and behind that appears to be dried, dead plant matter. Note that I don’t have attic access.
What is happening here?
Could it be a rodent issue?
An exterior vent that wasn’t screened properly?
Some bizarre diy method of obstructing a duct that wasn’t properly vented to prevent moisture from going too deep?
Should I break off that plastic piece and start clearing out all the debris behind it? Or should I just close this back up, pretend I never saw anything, and just be happy the bathroom has a window I can keep open?