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Is there any advantages to having (for example) 4 small firebox inlet dampers over having 2 big ones of equal square inches? Like four 3" x 6" instead of just two 6" x 6"?
No...but according to Feldon's calculator I need 55 square inches. The question was sort of general...all my measurements can be found here in a thread titled "is Feldon's calculator really flawed?"
I want to add an ash pan to the FB also. Does it need to be made out of 1/4" steel like the rest of the FB, or can it be lighter? 1/4" pan would be pretty heavy...