I am looking at building my first smoker, I have been researching hard for the many days now. Hours and hours but there just isn't any information that I can find about this! I am looking at building a large rectangular RF smoker (Chamber 78"x 29" x 29", firebox 29" x 29" x 29"). The only issue I am having is with the chimney ...... Current specs I would need a 7inch pipe that is over 30 inches tall. Adding a chimney that height would take the height well over 12 feet with the legs! The only thing I am going off here is one photo I found with a someone with a similar build only they had multiple smaller chimneys, four in fact. My question is this, If you put in multiple chimneys with the same volume as required for one chimney will that make the same the draft??? AND if instead of placing multiple round chimneys if i put in a rectangular chimney something of the dimensions of 4"x 27.5"x12" would that have the same draft as a large vertical chimney with the same volume?!?!?