Thank You Buzzkill
I have decider to use 9" x 4.5" x 1 1/4" fire brick rated at 2700 deg, now can i make the interior size 6" W X 9" T with the 3 burners inserted from the top dropped down 3" so the heat area would be 6" x 6", would this size hurt the heat transfer or should i cut the bricks down, also do I need end caps on this type of forge.