In this research, the indoor airflow has been investigated experimentally and numerically using a down-scaled model. Experimental study has been performed through PIV technique and the results have been used to study the accuracy of common turbulence models. The results show that both standard and RNG k-? turbulence models have acceptable accuracy; although RNG model depicts some priority. This research and its results are useful in getting a better understanding about indoor airflows and in providing a bench-mark to choose a proper turbulence model.