I have started a reverse flow cabinet smoker it's 24x23x48 I have a few questions one should I put my raceways on the side walls and back wall. My original plan was to a 1" deep x 17" wide x 31" tall raceway on both side walls then the back was going to be 2 raceways one on each side of the 2"×4 chimney they would end being 2"deep x 7" wide x 31" tall. My next question is how far from the top should the raceways end thanks in advance for any help