What is the primary purpose of a mechanical ventilation system?

The primary purpose of a mechanical ventilation system is to ensure adequate indoor air quality by managing several key factors, including temperature, humidity, and levels of air pollutants. A well-functioning mechanical ventilation system introduces fresh outdoor air into a building while expelling stale indoor air, which helps maintain a comfortable and healthy environment for occupants.

This system plays a critical role in removing excess moisture that can lead to mold growth, reducing harmful air pollutants generated from indoor activities, and regulating temperatures to enhance comfort. It is not limited to just controlling humidity or eliminating pollutants entirely, as complete removal of all indoor air pollutants is impractical and often impossible due to various indoor activities and off-gassing from materials. Similarly, while raising indoor temperature can be a function of some systems, it is not the primary goal of mechanical ventilation.

Overall, the correct choice encompasses the comprehensive approach necessary for maintaining a healthy and comfortable indoor atmosphere, taking multiple factors into account rather than just focusing on one aspect of air quality management.