I am getting ready to build some 16' (i.e., 8' butted up against 8') racks for seasoning firewood. Should be able to get over a cord in each row if I stack 5' or 6' high. Question is, how much space should I leave between rows to get them to season quickly? Obviously, the less space the better so I can put more wood on the property. However, I am just getting started and I need to get this stuff up to speed and seasoned ASAP.