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Trying to figure out what this might have been used for.

I am getting ready to heat my shop which is 30 by 36 with 10 foot ceilings. I am going to go with a radiant tube heater (i love that type of heat) but I am wondering about the Btu size. The walls are insulated with 3 inch foam covered with 7/16 OSB. The ceiling has R19 rolled covered with...