So this evening, I get a phone call from home that the CO alarm in the basement stairway was going off. Luckily, I was able to shoot home from work, and check on the situation.
I could barely detect the faintest smell of coal gas in the basement. I had the MPD closed, and all of the air intakes fully closed, just letting the fire burn extremely low. At this time, it was about 68 degrees outside. As soon as I opened the MPD and the ash door, the fire responded very quickly and was burning briskly in no time.
I decided to stick around and watch the thing for a little bit... Next thing I know, the CO alarm on the 2nd floor starts to go off. I was getting nervous, so I went and shoveled out the stove (2nd time this season!)
I had 6 of the windows open, 3 on the 1st floor and 3 on the 2nd floor, since it was so warm out today. Is it possible that I had CO coming back in the house from the chimney? I could smell the scent of coal gas outside the house. Or would it be more likely that I just had the stove dialed back too far, and CO was escaping from my not 100% airtight stove?