I would like to know how many of you insert owners have added a flue damper to your insert. This could be a dumb question because typically you cannot adjust it once it's inserted. But I have the back all exposed because it's in a see-thru fireplace. I'm thinking of putting one in because my heat seems to be going up the flue and i have a super strong draft. I'm thinking I could slow down the burn time and get more heat out of the box by doing so. Right now I have to run it with the primary about 1/2 closed , any more than that and I get to much coals that don't want to burn up.