Forge burners start sputtering

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just not sure why its happening got a 20psi regulator but after 5 or 10 minutes the burners sputter alot

Hey @Almightytaco welcome! Did you figure out your issue here? One guess I would have is the tank freezing up and needing more pressure, another is just the air regulator needing some help. That is quite an open are forge, I would think about making a little “bridge” of fire brick as just another observation.