Hi All, I am new here and I am working on building my first reverse flow smoker. I have found a good BBQ Calculator (feldons) that is helping with all the measurements but, I have a question. I am considering getting a CyberQ or DigiQ or one of those types of Airflow/Temperature controls for my smoker. I am wondering if any of you have done this and what size you recommend? In my research I have found 3 sizes that are 5cfm, 10cfm, and 25cfm. My smoker is going to be built out of a 120gallon tank with the size of the firebox TBD (feldons recommended approx 20x20x20 inches but may go a little larger). Thoughts? Thanks!