Fire modelling requires integrating the behaviour of hydrodynamics, heat and mass transfer as well as the combustion reaction. In the present paper, Jet Fires have been studied through CFD analysis, using the Reynolds-Averaged Navier-Stokes (RANS) equations, coupled with a ??-? turbulence model. The energy transport equation includes radiation terms. The temperature values obtained have shown an acceptable agreement with the experimental results obtained by IR thermography. Total heat flux values have also been analysed, indicating that there are some limitations in the model.