The internal pressure of industrial building in strong wind are observed. The characteristics of the internal pressure fluctuation in low-raise buildings due to wind action are investigated based on the results. It is recognized that the wind-induced internal pressure fluctuations are caused by the influence of the leakage on the surfaces of buildings and by the wall openings on the surfaces of buildings. The measurements of the reference pressure succeeded by means of the newly devised air-chamber. The similar results are also clarified by the full-scale measurements.
