| 21. | Careful attention to the placement and siting of the building has created natural ventilation system.
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| 22. | The system helped keep the interior cool by allowing natural ventilation as well as daylight.
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| 23. | They also impede natural ventilation, increasing climate control costs.
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| 24. | By using this system he combined energy saving and used natural ventilation and air conditioning.
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| 25. | Earthships have a natural ventilation system based on convection.
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| 26. | The construction of the grotto also utilized natural ventilation.
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| 27. | They are utilized for natural ventilation and temperature control.
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| 28. | Old buildings, with their natural ventilation, conserve energy.
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| 29. | The intentional introduction of outside air can be categorized as either mechanical ventilation, or natural ventilation.
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| 30. | Windows and overhangs are positioned to provide ambient lighting, and windows open to provide natural ventilation.
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