■Summary
The cold, clean outside air is warmed by the heat of the earth, heated with a small amount of energy, and brought indoors.The warmed air is then distributed to each room without using any energy, and at the same time it is properly ventilated. . That is the principle of a passive ventilation system. These are related components for natural ventilation systems that utilize temperature difference ventilation (chimney effect), which is primarily driven by the temperature difference between the inside and outside of a building, that is, the buoyancy of warm, light air at room temperature.
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