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Post by Karl L on Jul 6, 2020 22:29:33 GMT -8
Many, but not all, of the batch box designs I've seen on this forum have sloping floors, like a V-shaped valley.
What is the purpose of this shape on the floor?
Is it necessary in a smaller system?
Mine is 125mm riser size, with a 177mm-wide firebox. It seems to be working OK without it, but maybe it would be better with it?
(I think remember reading about this a long time ago, but I can't find the post now.)
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Post by Vortex on Jul 7, 2020 10:07:05 GMT -8
I think it's intended to push all the embers together in the coaling phase at the end of the burn to get a more complete combustion, as that part of the burn produces a lot of Carbon Monoxide. People seem to be moving to the Austrian way of dealing with the embers, where you close the air inlets so the embers go out and are left to be burnt in the next fire. I've been wondering though, if you're using the Austrian way is a V-shaped floor necessary, maybe peterberg would be kind enough to give us his thoughts on that.
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Post by josephcrawley on Jul 7, 2020 10:37:22 GMT -8
I have built the firebox with and without the sloped sides. With there are less coals left unburned. My stove I employ the "austrian" method and shut the stove down in the later coaling phase. There are plenty left in the morning! It is a bit of a pain to clean the ashes out without tossing out a lot of charcoal. For this I dump the coals through a piece of hardware cloth and toss them back in.
So it depends on how much you want to mess with the coals ultimately.
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