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The objectives of this research are to clarify the impacts of the stack effect in real high-rise buildings and to present methods to reduce the stack effect. For this, air pressure was measured in high-rise office buildings, and computer simulations based on the network model were executed to analyze the impact of the stack effect. The results of the simulations show that the problems due to the stack effect may be reduced with adequate architectural design solutions such as increasing air-tightness of building envelope and installing vestibules around entrance doors and elevator hall doors.