Si I am thrilled overall after ! month and into my 12th bag...but now my wife is pissed (rightfully so!) because when she wipes a cloth on pieces of furniture in the room, we are seeing a lot of fine black dust...?????? First I thought, well I was running a very rich fuel air mixture which resulted in my thich black sooty window...but that didn't explain where the black particles were coming from....? I can only assume that it is paint dust from the exhaust tube? Concerned! I also assume whether you have a wood stove or a pellet stove, there is bound to be a small ammount of particles being blown out...? So what is the story? Thanks, Bill