Well, it's almost time to start the shoulder burning season again. I'm going to add a damper to my setup. How high up the pipe do you put it? For some reason, 18" sticks in my head, but who knows why. Right now, my single wall pipe come out of the top of the stove, 20" to an elbow, another 24" to the wall thimble and out. It's a Hearthstone Heritage if that makes a difference.