Finishing my first year of wood burning with my quad insert. The only complaint that the wife has is the amount of gray dust in the room with the insert. The insert has two fans that run 24/7 that seem to be circulating the dust. I'm new to wood burning. Is this burnt dust from the air or is it soot that the fans pick up from the hearth? I was thinking about trying to attach some type of air filters to the outside of the fan grates to catch some of this dust. Does anyone have a similar problem? Possible solutions?