here's a picture of the side draft forge hood I built for my forge a couple weeks ago it's like 32"wide 14" deep 48"tall with a six inch smoke shelf a slanting floor. its made of 11 ga steel the opening is 10x12 the stack is 10" dia, x ten feet tall i'm still playing with it ...I think I'm going to have to put a wall up around it to stop the air currents.