When you write a column, you never know what kind of response you will receive.
Before I begin, let me forewarn you that not all inspectors understand how to evaluate an engineered combustion air design. Heck, I have had the experience where certain members of the staff of ICC didn’t understand how to engineer combustion air. It is easier to read numbers in a book rather than think about what they mean. But remember, the codes all allow engineered design of combustion air.