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The objective of this paper is to perform an experimental study of free convection heat transfer from staggered pin fin-arrays on heated base plate. The experiments represented by studying three orientations of the fins (upward, downward and sideward). The results showed that the sideward orientation gives better results as compared with other orientations. Nusselt number determined as a function of Rayleigh number at Prandtl number approximately equal to (0.7) for all tests, Rayleigh number infatcat:y5suepkk7jgkxebafm3vpyrixu