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Most households in major cities in Vietnam use air conditioning equipment for better indoor thermal comfort. However, to save electricity cost, the houses’ rooms are often closed when the air conditioner is running. This habit causes the raising of indoor CO2 concentration especially during the sleep night time. Therefore, mechanical ventilation is recommended to provide fresh air in. However, high polluted particle outdoor will follow outdoor air to get in the room. To comprehensively solving the above issues, the combination of central ventilation and air purification system have been applied. Their influence on indoor air quality within a residential apartment were tested and evaluated in this study. When the central ventilation and air filtration system was operated, not only indoor CO2 concentrations but also indoor PM2.5 concentrations were reduced significantly compared to those when the system was turn off. On the other hand, the study also found that the air purification capacity of the ventilation and filtration system was strongly depend on the air flow of the system, it increased when raising the air flow going through the system.
Xuan et al. (Tue,) studied this question.