My plumber in Tulsa told me to stop covering the old vent and it hit different
He was there fixing a leak under the sink and noticed I'd framed right over the old exhaust fan opening during my remodel. He said that's why the mirror fogs up so bad after a 10 minute shower, and now I'm ripping out drywall in a 6 by 8 bathroom to run a proper 4 inch duct. Has anyone else had a pro call out something you thought was fine?