Recently a high-rise building is built in many places. However some problems are occurred in the high-rise buildings. Especially, at the case of the kitchen exhaust using vertical shaft, the kitchen exhaust fan sometimes can not work normally because of unbalance of pressure inside the shaft. In this study, under the assumption that the kitchen exhaust system applied uniformly can not cope with the various changes of the outside environment, the vertical sectional characteristics of a kitchen exhaust using vertial shaft is analyzed. Outside temperature, number of the floors and operating ratio of the vertically connected fan are selected as major parameter. And it is analyzed by a network simulation method. In case of 60 stories building, the standard deviations are 115.6 at the second floor, 74.9 at the 30th floor and 20.7 at the 60th floor. The standard deviation at the lower part is about 5.5 times than the upper part. So the results of the simulation show that the kitchen exhaust system should be installed considering the vertical sectional exhaust characteristics.

The vertical impact crusher is the machine which could produce artifical sand similar to natural aggregates in the site of guarry and pits. FEM was used to analyse the stress and strength of the machine at high rotational speed. The test specimen was made from the same material as the shaft and tension tests were conducted. The Shaft under extreme conditions was analysed to determine maximum stress level and its location from the results. The maximum level of stress and its location could be predicted.