Section 326IAC1-2-19. "Combustion for indirect heating" defined  


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  •    The combustion of fuel to produce usable heat that is to be transferred through a heat-conducting materials barrier or by a heat storage medium to a material to be heated so that the material being heated is not contacted by, and adds no substance to the products of combustion. (Air Pollution Control Division; 326 IAC 1-2-19; filed Mar 10, 1988, 1:20 pm: 11 IR 2371)