My in-laws recently had a wood burring fire place insert added to there open brick fireplace. Its was professionally installed and has a blower unit also. After the unit was installed my mother-in-law noticed that she would dust the house and a day later you could run your finger across something and there was black soot. She had the company come back out and check everything but they said that everything was normal. I told her that this could not be normal, but I have no experience with how and why this is happening. If I could come up with a solution, I would be her favorite son-in-law for life!
Anyone have any ideas?