Hello all on my insert I have two openings on each side of the insert 1inch by 2 1/2 inches id say. Today for the first time when I opened the door smoke came out those opening. Close the stove door it stopped open it it started again. My draft rod was open fully when I opened the door. I was burning exceptionally dry pine pallets at the time. I believe it to be a draft problem? Striker C160 insert with approx 20ft of 6inch flex liner with Ventinox 6 inch off set adapter. Burning for about a month without incident untill today. Also I was able to hit the illusive 500 degree mark the other say on the top of the insert. Regular burn temp 350 to 375. Thanks