They say overfires happen just when you turn your back and Im no exception.... I decided this morning to go ahead and get a good temp rolling (500 on stovetop 300 on single pipe) and then loaded up the stove and let her simmer for a few minutes... went 20 feet to kitchen to pour a cup o joe came back into foyer and my support box is SMOKING! pipe temps were at 600. I prepared to soil my britches grabbed the fire extinquisher... shut down the damper closed air intake climbed a ladder to inspect the ceiling ... drywall cool to the touch, i slid my fingers behind the drywall and support box temps were ambient. went outside checked the roof...appeared ok. Opened windows and doors to let smoke roll out. that was about 2 hours ago. house smoke has cleared up, but foyer smells a bit like melted styrofoam. i do have rafter vents installed i wonder if one melted. ive been standing guard until fire dies down and then do a full inspection. edit : i suppose it was the stove paint burning off both the single black pipe and the support box. the guy who installed it all was a bit of a picasso and used alot of touch up paint to cover the bumps and scratches of the installation. i read somewhere each time you achieve a higher temperature the stove paint will give off a little odor. and since my flue pipe hasnt seen anything north of 300 it was just a matter of time before it cured again.