The report deals with 2-D numerical calculation of room airflow in an isothermal annex 20 room. The report documents the ability of the flow solver EllipSys2D to give results in good agreement with measurements for the specified test case. The flow solver is a finite volume code solving the Reynolds Averaged Navier Stokes equations.Five two-equation turbulence models were tested. These are the standard k-epsilon model, the low-Reynolds number k-epison model by Launder & Sharma, the k-omega model by Wilcox, the k-omega baseline (BSL) model by Menter and the k-omega Shear Stress Transport (SST) model by Menter.Except from the k-omega SST model by Menter, all the models lead to velocity distributions that are in good agreement with measurements. The poor performance of the k-omega SST model by Menter for the given flow can possibly be explained from the limiter applied to the eddy viscosity.Applying theory for a two-dimensional wall jet, measurements are compared with calculated values of the turbulent kinetic energy.