An experiment was carried out using a refrigerator model in which heat is transferred by natural convection. This transfer takes place between a cold vertical wall and the other walls, which are exposed to heat losses. The air velocity measurements were undertaken using particle image velocimetry (PIV). Circular airflow was observed in the cavity: air flows downward along the cold wall and upward along the other walls. The maximum air velocity (0.2 m/s) was observed near the bottom of the cold wall. Non-stationary airflow with recirculation was observed along the horizontal bottom wall of the cavity. Airflow is very weak (