guy's, I am in the middle of building an aof gassification arch and have a few questions. first it is a 3x12 so currently the plans for firebox(inside) is 32'' tall (grates to pans) 30'' wide(bricked) and 48'' deep. my question is 48'' deep enough? I herd 2/3 the length of the arch for good gassification but thats
8' deep on a 3x12.