In this project work, we are going to design the cylindrical fins. Fins are integral part of any heating or cooling system. Our prime objective is to obtain optimum heat transfer rate which will result in producing highly efficient fins. The main objective of this project is to present thermal analysis which is subjected to temperature variation on fins by varying temperature and materials. We know that by increasing the surface area we can increase the heat dissipation rate. This will help to determine better geometry and materials for fins to achieve better heat transfer coefficient. When any fluid flows through rectangular duct with heated object placed inside it, a respective pattern of flow carries heat through convection and radiation. Different profiled objects may give different rate of heat transfer. Hence the objects like pin fin with enhanced surface areas (Perforated) placed inside the duct, the heat transfer rate will be maximum. In this study, a review of different author’s research and their papers is carried out to understand the flow through the rectangular duct. Some of other cases are also studied and reviewed. All that methods are summarized and explained. Rate of heat transfer, mass flow rate, inside velocity, pressure and other associated parameters are studied and explained.