I have recently moved into a house with a flat roof and have noticed that when it rains the ceiling fan in the upstairs bathroom drips.
I've noticed that the water is coming in on the outside of the duct and I can see that some water has spread into the drywall.
I have been onto the roof and I can't see any holes in the duct or in the roof around the duct, although the duct is quite rusty.
Is this a common problem for a ceiling fan? Has anyone had anything similar and if so, what's the cure?