Alright iv been burning about two months now it was going good then in the last few days it's went to hell. I load up 4 med splits and when they catch I'll let them fully be a flame and shut door and they slowly die down to a smolder my wood is good I know that. My set up is 2013 13nc 6ft single wall to Selkirk ss chimney 15ft straight up it has the oak hooked up. Where all does it get it's air from?