fins to enhance heat transfer by increasing the surface are available for convection (and/or radiation). Fins are also known as extended surfaces, i.e., extrusions to increase the surface area by attaching to the surface extended surfaces called fins made of highly conductive materials such as aluminum. Finned surfaces are commonly used in practice to enhance heat transfer, and they often increase the rate of heat transfer from a surface several fold. This can be Extended surfaces or Fins are ge