I'm currently working on a fridge conversion. This is my third fridge smoker over the years and the last two had the chimney cut into the top. The last one really never even had a chimney, just a hole in the top of the fridge to let the smoke vent. My question being, is there any benefit to running the chimney out of the back of the unit rather than the top? I've seen them both ways and would like a little input before cutting into the back of my current project fridge. The small circle shown in this photo is from where the fridge light was installed. If I do cut an opening the bottom of the cutout would be at the bottom of the small hole. I'm considering a 5" to 6" cut-out as I'll be using a firebox from a chargiller for thie offset firebox. It would line up between the first and second shelves. The shelves are 8" apart.