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Indirect hot air furnace consists of burner, hot gas purifying chamber, heat exchanger, auxiliary equipment and control system. With gas countercurrent heat exchange, flue gas flows outside the pipe, flesh air flows inside. Flue gas countercurrent exchanges heat with fresh air. Part of flue gas is reclaimed, the rest is exhausted. Burner uses chain grate style, combustion steadily and completely. Set a high temperature dust purification device before heat exchanger to control the dust content, reduce dust and wear. Fuel coal and biomass fuels can be used. Heat capacity is 0.25-20 million kcal per hour. Heat temperature ranges from 50~600ºC.