In this study, to improve the performance of kitchen range hoods, a comparative analysis of air volume and noise is conducted using three ducts by changing shapes. It was found that the difference in air volume was caused by the pressure difference received by each shape. The noise data can be found to be no more than 60dB overall, except for the second tier of A-type. The difference when connecting the circular, square, and flexible ducts was judged to be due to some laboratory noise, and it was found that there was no difference.

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.