Uh oh. I have opened the bypass door and added wood several times when the CAT was in the active range. After loading, I closed the stove door, let the new wood char a bit, made sure the CAT thermometer was in the active range, and closed the bypass door.
What else would one do???
I dunno! Didn't get an answer. I have read that it's not good to cool the cat fast or open the door until the end of a burn cycle.
On the other hand, there are some that reload while the cat is still active so I was hoping to find out how and why from those with more experience.