The light well is often designed in the center of high-rise apartment buildings in Japan. This light well is an empty space without ceilings or floors from the bottom to the top, and this well is called "Void" in Japan. In this well, the exhaust from the kitchen and the gas water heater is sometimes discharged to the corridors surrounding Void, and the exhaust can pollute the air in Void. To keep the air quality in Void clean, the natural ventilation is usually depended on.
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