This paper describes the application of two fire field models to the description of fire induced flows in domestic sized rooms. A systematic and critical comparison is made of two commonly used CFD codes for fire modelling, PHOENICS and FLOW3D. Comparisons are based on upper-layer room temperatures, mass fluxes in and out of the fire compartment and door-way vertical and horizontal temperature and velocity profiles. Given identical meshes, both models agree reasonably well with the observed trends. A close examination of the horizontal door-way velocity profiles highlights the need for careful modelling and experimental practices.