How does supply ventilation function?

Supply ventilation functions by actively bringing outdoor air into the home while simultaneously allowing stale indoor air to exit. This process helps to ensure that fresh air is introduced into the living environment, improving air quality and reducing pollutants.

When considering the operation described in the correct answer, it is important to recognize that supply ventilation systems are designed to maintain balanced airflow by forcing outside air into the home through ductwork or other mechanical means. As fresh air enters the living spaces, it can displace the stale air, which then exits through existing vents, gaps, or leaks in the building envelope, ensuring that air exchange occurs without relying on passive leakage alone. This operation is crucial in controlling humidity levels, diluting indoor contaminants, and enhancing overall occupant comfort.

In contrast to other choices, the focus on actively pumping outdoor air rather than just relying on passive air exchange distinguishes supply ventilation as an effective strategy for maintaining a healthier indoor environment.