Recently most houses in northern Japan are highly insulated and air-tight, which can lead to seriousproblems such as indoor air pollution. It is important to evaluate the performance of an air-tight housefrom the viewpoint of ventilation. However, in general, houses consist of multiple rooms and each roomhas airflows in different directions which mix with each other. Therefore it is not easy to measure realventilation rates.The purpose of this paper is to evaluate a simplified method for measuring airflow rates in houseswhich have a basement with outer insulation.
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