How many cubic feet of air enter for each cubic foot that exits in a home environment?

The choice indicating that the air exchange rate varies and is not always the same is correct. In a residential environment, the amount of air entering compared to the air exiting does not follow a fixed ratio; it depends on several factors, including the home’s construction, ventilation systems, and environmental conditions.

Factors such as leaks in the building envelope, windows, doors, and the operation of appliances can influence the airflow dynamics. For example, when the wind blows against a house, it can create pressure differentials that affect how much air enters or exits. Additionally, human activities, such as running exhaust fans or using combustion appliances, can further change the air exchange rates.

Thus, the specific volume of air that enters for each cubic foot that exits can fluctuate based on these variables, making the situation dynamic rather than static. This understanding is crucial for assessing indoor air quality and energy efficiency, as it informs decisions on ventilation and air sealing strategies in building performance analysis.