All the electronic components release heat during their operation which must be transferred to the surrounding and its proper and intended operation and to avoid the damage of the equipment. The main aim of extended surfaces is to limit the maximum temperature in the metallic walls. Hence increase the possibility of using the least refractory material and minimizing the material and processing cost. Generally, the extended surfaces (fins) are made up of the materials having high conductivity like aluminium. The heat transfer will depend on the geometry of the fin like length, thickness, cross sectional area, width, spacing between the fins and the operating parameters such as heat supplied to the device, material of the fin, orientation of the fins, temperature difference between the fin and surrounding, number of fins, fin array orientation etc.as the electronic devices and engines developed, heat generated from them increases and while the surface area of the electronic equipment decreases continuously.