I have a bmhg roaster set up at home with some four inch ductwork which is getting pretty caked with some chaff dust or whatever it is. I use a vacuum cleaner motor with a home made wood/dust collector type thing for chaff collection and smoke removal.
I was just curious how others have handled cleaning their roaster ductwork. I was thinking one of those 4inch brushes for dryer vents would work quite nice but not having done this before was interested in what others think. Thanks.