Extended surfaces commonly known as fins offer an economical and trouble free solutions in many situations demanding heat transfer. Rectangular and Triangular fin with no perforated and with perforated have been investigated through CFD in free and forced convection to find out temperature and heat transfer coefficient of all fins in order to achieve the high rate of heat transfer of fin material. Heat transfer rate is compared under same dimension and equal volume conditions for all fins. The results show that in case of forced convection through perforated fins the airflow over the perforated surface hence reduces the total area of heat transfer, which reduces the overall heat transfer