If you’re concerned about mold, you should check your ceiling fan or ceiling fan room for any signs of the problem.
Mould can spread easily from an opening to an exit.
If you have an old, faulty ceiling fan with a cracked or broken fan shroud, you may need to replace the fan shroud.
A new fan shroud is often available for less than $10.
There are also cheap plastic fans available at most hardware stores that don’t need a replacement fan.
You can also check your attic to see if there are mold spores or other problems with the attic.