Natural ventilation uses primarily which of the following?

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Multiple Choice

Natural ventilation uses primarily which of the following?

Explanation:
Natural ventilation relies on passive air movement through openings in a building, driven by natural forces like wind and temperature differences. Doors and windows are the primary means because they provide the openings that allow outside air to flow in and indoor air to exit without any energy input. When placed across from each other, they enable cross-ventilation; warmer air rises and can escape through upper openings (stack effect), drawing cooler air in through lower openings. Mechanical fans, HVAC systems, and air conditioning units involve powered equipment that actively moves or conditions air, so they are mechanical solutions rather than natural ventilation.

Natural ventilation relies on passive air movement through openings in a building, driven by natural forces like wind and temperature differences. Doors and windows are the primary means because they provide the openings that allow outside air to flow in and indoor air to exit without any energy input. When placed across from each other, they enable cross-ventilation; warmer air rises and can escape through upper openings (stack effect), drawing cooler air in through lower openings. Mechanical fans, HVAC systems, and air conditioning units involve powered equipment that actively moves or conditions air, so they are mechanical solutions rather than natural ventilation.

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