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This paper describes the experimental study of square ducts with inserts. Experiments are conducted for air with uniform heat flux condition. The top wall surface is made rough with metal ribs of square section. The roughened wall is uniformly heated and other walls are insulated. The heat transfer coefficient enhances square channel at injection of different inserts. The performance of the geometry under investigation has been evaluated .The heat transfer coefficient of air is increase by 46% than plane square ducts with inserts. The heat transfer and pressure drop measurements have been taken in separate sections .