Abstract
The purpose of ventilation is to provide clean air to occupants in the building. Therefore, ventilation is generally defined as “the introduction of unpolluted outdoor air into a room and the removal and dilution of polluted indoor air to the outside“, thereby ensuring a healthy and comfortable environment in the occupied areas. In this paper, an overview of the ventilation rate required for indoor air quality, and the concept of ventilation efficiency and various ventilation efficiency indices are introduced. The evaluation results of the effective ventilation with air purifiers using the Wells-Riley model, which predicts the probability of infections.
