Which ventilation method involves bringing outdoor air into a building to improve air quality?

The method that involves bringing outdoor air into a building to enhance air quality is known as supply ventilation. This system actively introduces fresh air from outside into the interior spaces of a building, which helps to dilute indoor pollutants, control humidity levels, and maintain overall air quality. By effectively replacing stale indoor air with cleaner outdoor air, supply ventilation contributes to a healthier indoor environment.

In contrast, exhaust ventilation involves removing air from the building without necessarily bringing in new outdoor air, which can sometimes lead to negative pressure and inadequate air exchange. Balanced ventilation systems attempt to provide equal amounts of supply and exhaust air, but they do not focus solely on introducing outdoor air as a means to improve air quality. Natural ventilation relies on natural forces like wind and temperature differences to facilitate airflow, but it is not an active method of bringing in outdoor air in a controlled manner. Thus, supply ventilation is the optimal choice for improving indoor air quality through the introduction of outdoor air.