Still thinking on how to proceed forward. In the mean time... more videos So I connected up another stove pipe setup (Olympia stove pipe without the long seams and (2) 45 degree elbows. Operated the stove for 24 hours with the thermostat set to 80 degrees and flue temps above 300F. The goal was to see what the inside of the new stove pipe would look like after 24 hours. I expected the look to be the same as the clean burn of my pellet stove, however still black gloss looking.