Is that for circulation of the hot air into the room, or does it need it to burn right? My woodstove has a blower on the back. pushes air between the double wall and out the slot on top of the front. Wasn't working and I just gave it a bump and it started. Oiled it and seems good again. However,...we might be done burning this year. Every time, we get a little water draining from chimney and smells horrible. Think I need to let it warm from outside and completely thaw. Then repair top so it can't do it next year.