Natural ventilation systems rely on natural forces such as wind and the buoyancy of hot air to ventilate a building. They use openings such as windows, doors, and vents to allow fresh air to flow in and stale air to flow out. Mechanical ventilation systems, on the other hand, use electrical or mechanical devices such as fans, ductwork, and air conditioning units to circulate and ventilate indoor air. They can provide more precise control over airflow and air quality, but they also consume more energy than natural ventilation systems.
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