I've got a 30nc that I have been running for about a month now and I know the stove tends to run a little hot for a lot of people. I'm not sure when it gets to the point where you need to add a pipe damper to slow draft and help control it a little. I've got about 20 feet of pipe and chimney. This morning it's about 8 degrees out which is the coldest we have had so far. Stove was about 180 when I got up and cleaned some ash out. Loaded it up and closed the door once it caught. By 350 stt I had the primary air closed to the point where half the chrome handle extended beyond the lip. Shut all the way down by 500 with secondaries strong already. At this point the baseball sized area around the middle of the stove / slant up is all 750 to 775 and pipe probe thermometer is 750-800 also. Already have magnets on the secondary air cutting each of them off by about 1/3 to try and see how that helped. And it did I think but I'm not sure if it's enough?