I saw the word topless and thought it may have been a more interesting thread. Anyway, I just want you to take a look at this thread on hopper fires: Hopper Fire - Alaska Channing 3 with direct vent
I'm not sure of your setup so.....................Just be careful because coal burns very, very hot and it's not a joke. It will burn your house down if u do something stupid - not that u would.
The first time I had a hopper fire I couldn't sleep at night thinking it might happen again and burn my house down. I found the cause of it and took care of the problem. I even bought a snap switch/probe so if the temp of the hopper reaches say 140 degrees the snap switch will activate and turn off my stove by opening the circuit. This is a safety device that should be on all stoves and may even be on the Leisure Line.