The Heat transfer rate is enhanced byincreasingthe heat transfer coefficient & by the area of heat transfer.Free convection has the only method for increasing heat transfer area by providing extended surfaces. The enhancement ratio of heat transfer depends on the fins orientations and the size and shape of fin arrays. The Aluminum material was used for testing and the experiment was carried out on different fin geometries. The experimentation procedure and the analytical calculations have been carried out successfully and values of heat transfer coefficient for both notched & un-notched fins are defined. It is proved that the heat transfer coefficient is highest for the set of fins with triangular notch (7.161W/m2k) at base temperature 700c and (8.193W/ m2k) at base temperature 100°c.