Single sided natural ventilation occurs when there is one or more openings on one exterior wall of a building, Wind produces the inconstant and heterogeneous air velocity distribution through an exterior opening due to its uncontrollable feature . Consequently, high accurate measurements at a great number of points are required in order to predict the air velocity at the opening successfully. This, as a result, makes this kind of experiment difficult and very expensive to perform .In order to solve this problem, A new experimental procedure was developed to offer a simple, convenient, accurate and inexpensive experiment method.