A few weeks ago I was cleaning the Castine and I noticed two holes on the doghouse that is over the primary air slide plate. I mentioned this to Well Seasoned and I took these pictures at my first chance. I haven't really figured out the airflow through this stove yet and there is no mention in the manual that I can see of keeping the area free of ash buildup. Inside of stove looking back towards the door. Cover removed lower half of the two holes. Does anyone know what this bolt does under the cover? I was thinking it was a restrictor for the primary air plate to prevent it from sliding a certain distance over. It does not seem to touch anything that I can tell. The area where the slide plate is vey clean. I dropped a little ash down there taking the cover off. So this makes me believe that air is pushed/pulled out the holes.
I am aware of those 2 holes allowing air into the firebox. This is where I see the air burning away at the wood closest to the doghouse. There is also 2 tabs there to prevent the wood from touching and blocking those holes. As far as that bolt goes, I too thought it was to prevent the air lever block from going too far one way.