Long story short the jackasses that built my house put the chimney in the wrong spot and also told me it was duravent but after doing some research it appears to be Security. Hear are some pictures. I need to run double wall down to my Kuma. I don’t understand much about stove piping but it seems to me that there would be a gap between the stainless pipe in the chimney and the stainless portion of the interior double wall pipe since the exterior chimney pipe doesn’t come down far enough into the ceiling box. What are my options?