first i would like to say hi, i am brand new to the smoking game. my name is dean and i live in quebec canada. i have a few of many questions, first is, my smoker is being made from a old compressor tank" i think it is 33gal. and the forebox is a old bbq propane tank, i have them both mostly built i was just wondering for that size of smoker how big should the passage from the fire box be? and how big should the exhaust be? thanks so much any info would be apreciated.