Does ASTM E779 - 19 indicate a preferred pressure for reporting air leakage?

ASTM E779 - 19 does not specify a preferred pressure for reporting air leakage. This means that the standard provides flexibility for testing under various conditions without prescribing a fixed pressure point for that purpose. This adaptable approach allows building professionals to choose a pressure level that best suits their building's characteristics and the specific circumstances of their air leakage testing, rather than be limited to a single applicable pressure.

While the other choices suggest specific pressures, they're not mandated by the standard, allowing for variability based on project needs or conditions being evaluated. This can enhance the relevance and applicability of the results across different types of buildings and testing scenarios.