Ventilation
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Description
The process of refreshing the air in an interior space. Ventilation provides oxygen and diminishes carbon dioxide, moisture and odors. Natural ventilation uses openings in the building, such as window, doors and vents, to allow air to circulate. Starting in the mid-19th century, mechanical fans and heating units (forced air heating systems) were used to circulate warmed air. In the 20th century, the use of combined heating, ventilating and air conditioning (HVAC) systems became prevalent for controlling air quality (temperature, humidity, circulation and purity) in interior spaces. These units are usually automated with sensors and computers to provide optimum conditions while conserving energy.
Additional Images
Air handler unit
