There isn't a gravity feed calculator out there like you see for the conventional and reverse flow smokers. You're best source would be to order up the plans for the mini and make any modifications from there. I'm not a 'follow the instructions' kind of guy and I found them invaluable when I built mine.brockmanes1 wrote:Oh I don’t want to build one that big. I m thinking something similar to a mini. I just need to learn more on the firebox and chute setup