I've finally got to use my Napoleon 1402. I'm using it with the damper pinched back most of the time, and I'm noticing allot of brown around the chimney cap. Maybe this is normal? I'm damper-ed back because my interior temp, and to make the wood last longer. Should I burn hot a couple hours a day for creosote burn off, or continue the way I am. I've got a nice 4 in hot coal bed after 8 to 9 hrs, relights small splits fast.