A method for predicting air infiltration rates for a tall building surrounded by lower structures of uniform height.

Describes wind tunnel measurements made on a model of a tall building surrounded by lower buildings under various combination of wind speed, wind angle and air temperature. Gives method for calculation of air infiltration rates and describes the computer program used. Concludes that air infiltration is a strong function of wind direction. Finds that maximum air infiltration was produced by a wind that approached at 0 deg and the minimum air infiltration occurred at 75 deg wind angle. Also finds that if air infiltration rates caused by wind or stack action acting separately are equal, the air infiltration rate caused by the combined action is higher than that due to each action by about 40% for wind angles of 0 or 90 deg. and 6% for 45 deg.