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Hello all! My wife gifted me a Mr. Heater Big Maxx 50,000btu heater for Christmas. I plan to convert it to propane. I also live at roughly 5,500ft above sea level. I have a 25x35 steel building (875sq/ft), 10 ft walls, 14ft center height, 3" (r-10?) wall insulation, 4" (r-13?) roof...