Ok. It's only been a little over an hour, so this may be a bit premature. I picked up my rock wool from Slowe's and installed it above, behind, and beside my insert. I have a metal block off plate already. The house was 65 degrees, outside is 45, and the stove was about 100 from a fire last night. Not good draft weather at all. I put some kindling in the stove, a little bark, and some sizzle and burn pieces of wood, I'm trying to get rid of before cleaning the liner and switching to the good stuff. The stove lit off well on the bark. I heard the other stuff starting to sizzle a bit. I had good flames and the temps were coming up. I closed the door. Everything is going well. I start shutting the air down. I get it to about an inch open, and I say what the heck I'm going to shut it all the way down and see what happens. Normally, my Summit won't burn well all the way closed. The fire died down. I had some flashes of flame as the EBT starting moving around, but the secondaries didn't stall out. It's been over an hour, the stove is running along at 500 and the secondaries are just beginning to die out. It's a nice peaceful burn on so so wood with less than stellar draft conditions. Not bad for a half a milk crate of scrap wood. I have the blower on a pretty low setting, so hopefully as it gets colder and the draft gets better, I can turn it up and get more heat, while still letting this thing run on the EBT.