We are looking at a new class of kilns that are ultra simple and clean. Charmaster Dolph Cooke, from the lush forests of Northern New South Wales, Australia, is a leader in the open source biochar tech movement. I love his latest kiln, inspired by his amazing mentor, Geoff Moxham. Geoff died tragically in a woods accident a few years ago, so let that be a reminder to us all to keep safety first in mind, especially when dealing with big, hot kilns like the Moxham. You can still glean some of Geoff's wisdom at his website, Bodger's Hovel.
Here is a nice video that Dolph made on the Moxham Kiln: