O.K. last year when I did my stove clean and prep for the coming winter, I took out the rockwool mat that sits on top of the ceramic bricks above the secondary burn tubes. I know what the function of this is for, but it is a pain to do a good clean with that thing, and I never really liked it in there. Maybe I didn't trust it for some reason. Any way, I left it out. I have a small Country Comfort, about 2 cu. ft., so I burn hot fires in it. I burned 24/7 this winter, real good wood, still had good secondary burn going, without the woolmat in the stove at all, all winter long. I noticed no difference in the secondaries, no more smoke, and no difference in wood consumption. In other words, no difference at all. Question? Any one else done away with the rockwool mat above their burn shelf??? Notice any difference?? 13/14 split and in the shed.. 14/15 in rounds and being worked on now.. 15/16 on the grounds in rounds.