This paper present experimental measurements of velocity distribution at different sections around a reduced scale model of a real domed-roof building with several openings. Measurements are made in an open loop wind tunnel with atmospheric boundary layer. A new modified Counihan scheme which is a combination of the two systems is developed for the purpose of part-depth atmospheric boundary layer (ABL). The measured quantities are wind velocity profile, turbulence intensity, and air flow pattern around the building. For experiments a 1:54 scale model of a domed-roof building with six windows and an aperture on the roof is made. In addition, by using a numerical solution, turbulent air flow around such scale model in the wind tunnel is simulated and flow field inside the model and also the discharge coefficient are computed during the economizer mode.