Propane from a Bernzomatic TS8000 torch, nothing very fancy since it's my first forge. I'm in Virginia, I'll get the profile info updated. It's a paint can forge, 2-1" layers of kaowool for insulation. Rough chamber is 3"x8". Right now it's just the torch head attached to one of those blue 14oz canisters, torch goes through hole in side of forge. Thanks in advance for any help.