So in my basement 30NC, the coals get covered in ash, and the whole thing turns into a big lump. It would be great if I could have a grate to shift the ashes through and allow the coals to remain in the firebox and burn down further. Not as big of an issue now that I have my FP25 upstairs to carry most of my heating load. When I was using that as my only woodstove, it was super frustrating to come down after an 8-10 hour burn and find a 200 degree stove that's still half way full.
Really agitate the coals. The ash will fall to the bottom, larger pieces move to the top. It works the same as in an avalanche.