outside

What is the optimum depth? The compressed air comes from a compressor through a long hose and is easily regulated. I use the air to get my charcoal bbq going and it works amazingly. I doubt it is explosive, unless of course you were to heat up the tank.

Thank you everybody. I will be using charcoal as my fuel because it is readily available and I don't like gas. The brake drum forge looks tempting but I might just weld up my own design. Narrow and deep? How deep is too deep? I would also like to use compressed air from my air compressor as my source of air, what do you think?

I'm looking at building a forge and stumbled across this site. Glad to meet you all and look forward to learning from you.