As Buildings have been designed and constructed to be airtight since the energy crisis the indoor air quality have become worse. The objective of this study is to improve airtight and IAQ problems through the natural ventilation.The previous study shows that recently built flats are more airtight than flats in past. Natural ventilation systems using form tie holes and trickle ventilators were proposed and performances of natural ventilation were predicted.The result shows that form tie holes cannot satisfy the target the air change rate, 0.35/h while a combination using the form tie holes together with the ventilator within the window frame provides the air change rate, 0.47/h.
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