What is one of the main purposes of mechanical ventilation systems?

The primary purpose of mechanical ventilation systems is to provide fresh air and eliminate contaminants from indoor environments. These systems are designed to actively bring in outdoor air and exhaust stale air, promoting better air quality and comfort for occupants. By doing so, they help reduce concentrations of indoor pollutants, such as volatile organic compounds, allergens, and carbon dioxide, which can accumulate in enclosed spaces and potentially lead to health issues.

Mechanical ventilation can utilize various methods, including exhaust systems, supply systems, or balanced systems that incorporate both intake and exhaust functions. The introduction of fresh air helps to dilute indoor air pollutants, thus maintaining a healthier environment. Moreover, such systems can incorporate filters that further enhance indoor air quality by catching particles and allergens.

Options reflecting the increase of carbon dioxide levels, reducing humidity to zero, or filtering outdoor air pollutants exclusively do not properly address the primary function of mechanical ventilation, which is to ensure a consistent supply of fresh air while managing overall indoor air quality.