Gas / propane forge advice (new to gas) in Gas Forges Posted November 14, 2015 Thanks for the info. After doing some more research it looks like I will be building another, bigger coal forge rather than the gas forge at this point. As per Wayne's instructions (thank you very much, super informative) I'll be building a gas forge similar to what you've constructed for the mobile welding/fabrication workshop i teach in the summer. For the winter however i'm going to burn normal smithing coal and vent it high. My concern was that where I moved to (house and shop) that my neighbors might not be keen on the smoke. After talking with some folks in the neighborhood it seems like it wont be an issue.