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� � This study discusses the evaluation of influences on the drainage capacity of a drainage stack system with an air admittance valve by means of the drainage capacity prediction method, which was previously proposed by the author, while looking into the effectiveness of the method. The study also aims to propose a method to reduce labour and cost incurred by drainage capacity experiments. To be more specific, through this study, the following two points have been clarified: (1) Vent characteristics of five commonly available air admittance valves were identified using a simple experimental apparatus and the relationship between the airflow rate and the air flow resistance coefficient was acquired; (2) The results acquired from (1) were applied to the previously proposed drainage capacity prediction method and subsequently, it was found that the discrepancy between the estimated value and the actual value remained within �10%, demonstrating that the method is effective in practical application.