I use a very, very dirty coal. however, i can get it for $10.00 per 100#. So, brake drum forge does not work, clinker clogs the grate in minutes. so, without further adieu, the Trough style 55 side blast with chimney. Thoughts? ideas? suggestions? also, for updates about the building of this, check my blog in the blogs area, Toolception; Claw to peen. Thanks! click on the image to zoom in. thumbnail is quite small