It is late and I am typing on my phone so please excuse grammar mistakes upfront. I have a new osburn 2300 and it was bUrning great for a week until yesterday. Now fires are not continuing unless door is open. Not getting secondary burns. Lots of smoke out door while starting. Smoke is now coming out joints of the single wall black flue. Flue is about 7 ' to ceiling with two 45 bends at top into box in cathedral ceiling. I have about 7' of triple wall out of roof. New system I just put in a few weeks ago. Wood is same as when it was burning great. I had no difficulty starting or mantaining good burns last week. No smoke in house, but know I am smoking my family out. When I use air control it has no effect on fire. Please help.