Not trying to highjack, it was a normal morning reload decent coal bed maybe 200 stove top. chimney set up 20 ft uninsulated 5.5 in liner in exterior chimney double wall inside. The secondary air control is on the back of the stove the bottom center, it looks like one big square with a divider in the middle, the side toward front of stove is primary with the slider. The side on the back unregulated is the secondary air