What is one of the main functions of a positive pressure ventilation system?

A positive pressure ventilation system primarily functions by introducing fresh outdoor air into a building while simultaneously pushing out stale indoor air. This process is particularly effective in removing indoor pollutants, allergens, and contaminants, thereby improving indoor air quality. By creating a slight pressure difference, the system ensures that fresh air flows into the building and pollutants are expelled, which contributes to a healthier living or working environment.

In contrast, options focusing on energy efficiency, humidity control, or temperature reduction do not align with the primary purpose of a positive pressure ventilation system. The main goal is air quality enhancement through effective pollutant removal, making the selected answer the most accurate reflection of the system’s primary function.