Today I had my garage fill with smoke, I had the stamper door shut on my heat pro furnace. The only thing I can think is that I either had a back draft or I lost draft in the chimney causing the stove to release the smoke though the air intake vent. I open the draft door and the smoke inside the stove ignited, the chimney warmed up and it worked fine, I have a Drolet Heat Pro. Anyone else have this happen to them? I cleaned my chimney a week ago so it wasn't a chimney fire. Any help thanks.