make sure it has drain holes on the pan (if you have a pan at all?). 1/2" gas line only for 70'? I have not calculated it yet, but I go 3/4" instead. 12' of flames? what are you trying to do, keep your neighbor away
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I built many on hill side decks that act as fence. They are long normally 10-14' and about 8-14 inches wide. I will try and get you a pic of my own sometime tomorrow.