Mike, what sort of jacket (lining) do you have on your forge? Is it the standard Kaowool/ITC? Sounds like a rectangular shape- does the burner shoot straight down, or swirly? > The propane forge heats, by heating the refractory, whatever it > is ,and the heat from the refrac. heating the work. My little > forge has a 11x 8" is a venturi forge it has a #51 orifice and > will weld on 10 psi and forge on 4 -5 psi >