In which ventilation type does outdoor air directly replace the stale air?

The correct answer pertains to a specific approach to maintaining indoor air quality by directly addressing the replacement of stale air with fresh outdoor air. Positive ventilation involves introducing outdoor air into a space at a rate that exceeds the rate at which air is being exhausted from that space. This approach ensures that there is a constant influx of fresh air, which helps in diluting indoor pollutants and moisture while minimizing the challenges associated with air pressure differences.

This process typically employs mechanical systems, such as fans or air handling units, that actively push outdoor air into the interior space, ensuring that the stale air is pushed out and replaced with fresh air continuously. This is especially helpful in tightly sealed buildings where natural air exchange might be limited.

Other types of ventilation, such as balanced ventilation, negative ventilation, and natural ventilation, operate under different principles, focusing on different aspects of air movement and exchange, creating circumstances where the conditions or mechanisms do not directly mirror the functionality described in this question.