According to ASHRAE-62.2, what is required for ventilation in homes?

ASHRAE-62.2 outlines standards for ventilation in residential buildings to ensure adequate indoor air quality. The requirement is to achieve a balance between sealing the home for energy efficiency while providing a controlled method of ventilation. Option A reflects this dual approach by advocating for the sealing of homes to enhance energy performance, while also specifying the need for either exhaust or supply ventilation systems. These systems help to manage airflow effectively and reduce the accumulation of indoor pollutants, thereby improving indoor air quality.

The other options do not align with the ASHRAE-62.2 guidelines. The second option, which suggests relying solely on operable windows and natural ventilation systems, does not account for the need to have a consistent, reliable source of ventilation that may be necessary, especially in tightly sealed homes. The third option, maintaining air leaks, would actually compromise air quality rather than improve it, as uncontrolled leaks can lead to a buildup of pollutants. Lastly, the fourth option of using gas-powered air filtration systems focuses only on filtration without addressing the essential ventilation needs outlined in the standard. This can create additional safety concerns because combustion appliances can produce harmful gases if not properly vented.

Overall, the correct choice encapsulates the balance between energy efficiency and quality indoor air management,