Shouldn't the draft cut back when you fill the pot with ash and coal??
You would think! I don't know how the fire stays alive once the fan goes off, doesn't the ash choke the air off?
Here is what I did. After trying a few things with the stovepipe at the baro and not getting anywhere, I decided it's too much blower for me. I took out my trusty calculator, measured the fan and motor pulleys and decided to switch them to reduce the blowers pull. I figure the fan was turning about 2K and when I changed the pulleys it dropped to about 1450 RPM. The thing is nice at that speed and pulled .02 draft cold. OK, that's better, I fired it up! Been running an hour and a half and has stopped ashing. I have all the doors open and the heat on to put a load on it as it's still about 60* here now. Every thing looks Kosher, I just need to make sure it doesn't overheat when I cut back on the thermostat. At idle the draft is .015-.02 and with the blower running it runs .02-.025, I can live with that, I think it is just running off the timer right now.