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This study describes to analyze variation of carbon dioxide gas concentration by experimental and theoretical method according to the using patterns of ventilation system in a model classroom. Concentration of CO2 gas varied by the occupancy and the ventilation systems are operating or not. More than 850 CMH ventilation system can maintain CO2 gas concentration lower than 1,000 ppm along the class time and can be adopted the government guideline. Theoretical modeling of the concentration was performed at well-mixed ideal condition. Delays of concentration decay were shown at each case compared to actual.Keywards : 환기(Ventilation), 농도(Concentration), 교실(Classroom), 탄산가스(Carbon dioxide)기 호 설 명