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I found a 120 horizontal propane tank that i am going to purchase and im wondering what the ideal size would be for the fire box propane tank? any info would help!
Welcome. I'm not a builder, but there are a couple of calculators on here that folks use for all the sizes, dimensions and other stuff. However, one thing I've learned is that the FB should be about 30% of the CC. So, I'd say around 40 gallons.
Good luck. Go to the smoker build section and look or click on the search bar and enter your question.