The manual describes a demonstration, utilizing a dry media heat exchanger for producing hot blast air for cupola melting, to test both the technical feasibility of this type of heat exchange unit and the validity of the economic assumptions that indicate a savings in fuel, air pollution control equipment costs, and a net reduction in operating costs. It describes the system, provides estimates of the gross economic benefits, presents the capital cost of the system, and briefly describes operation of the system to date. The use of exhaust gas heat from an iron foundry cupola has long been an objective of the industry. Unfavorable economics and technical limitations, however, have limited development and employment of cupola waste heat devices to a relatively few installations. Recent laws requiring air pollution control on cupolas have resulted in major capital expenditures in cupola melting facilities. This required control and recent energy shortages have led to renewed interest in such devices. (Author)