There are lots of questions about direct venting pellet stoves and the general concensus around the hearth is that it is not the best method. I want to explore the other extreme, backpressure caused by pellet chimneys that are too tall and not large enough in diameter. My main question is how do you installers balance backpressure issues with not wanting to soot up the side of a house? Do you feel that all backpressure issues are alleviated by staying within chimney height and diameter guidelines? When I was an installer I didn't really run into any backpressure issues. Are they extremely uncommon?