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I just built a furnace, I don't even have a fuel picked out yet (post answers pending), and I want to spend as little money as possible until I get into it and know that I'll enjoy it enough to put money into a proper bellows. At the moment, would a vacuum cleaner that blows work as a bellows when connected to a steel pipe? The pipe goes into the base of the furnace so the air is blowing directly onto the coal/charcoal (again, fuel question answers are pending - Coal vs. Charcoal) in the bottom of the furnace. I'm not just using the furnace to heat metals; I'm also using it (with a crucible) to melt soft metals to cast into jewelry.