When stove specs state that a stove will take 'up to 18" logs', is 18" generally it? Or can a 19" log usually be elbowed in? I'm sitting on about 14 cords of split, stacked and seasoned hardwoods and want to make sure that I don't end up with a stove that will force me to sell some of it or cut it shorter. Most of what i have is 18", give or take an inch. How critical is it?