I have a woodstove insert with a 6" liner that goes all the way up my chimney. I'm curious as to how often most people have this type of set up cleaned. We burn about 3 cords a season, mostly well seasoned hard wood, and we burn relatively hot, only taking the damper down past 1/2 way at night. We had it cleaned once this year, but I'm wondering if we need to have it swept more than that? Once a month I break the inside baffles down and brush the inside of the stove out and clean everything out, but just curious how often I need to brush the pipe out. Will once a year suffice? Thanks for your input.