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    Propane Unit Heater Sizing

    Hello, I've got a 30x40x12 pole barn that I had closed cell spray foamed at 3-4" on the ceiling and 2-3" on the walls. I've got one insulated 10x10 door, a man door and three small double pane windows. The slab is 5" thick and uninsulated. My location is near Colorado Springs at about 7,400'...
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