I have a 30 gallon compressor tank for a firebox,under a 55 gallon SS barrel, my thought is to leave about 1" air gap between the two and run a stack out of 30g firebox into bottom(back) of 55,I was thinking 2"x10" approx 4" long will this work? how big of a stack out of the 55 gal should I use? thanks for any help.should i space them apart more? should I not put the firbox under the drum? I just really love the look of this layout.sorry for such noobness.....Thanks guys and gals great forum!