I converted to gas last year so didn't use my Harman p35i much. But this winter with three unused tons of paid-for Barefoots in my garage it makes sense for me to burn pellets. After a week of good burning I decided to do a top-to-bottom clean, including a Linteater scrub of my 28' flue. I'm pretty rigorous in my cleaning so I was disappointed that after a good scrubbing my flame was anemic -- slow and dull. I re-pulled the stove, re-explored the flue thinking that I had maybe caused an obstruction at the very top; checked to see all of my connections, and on and on. Finally, today, after the third investigation, I noticed that I didn't put the fine box cover on right -- the wing nut was sealed at the bottom, but the top part of the cover wasn't properly seated on the tab. I just mention this because, well, you learn something new every day.