Which air testing standard does not provide an option for a building enclosure test?

The correct answer identifies ASTM E779 as the standard that does not provide an option for a building enclosure test. ASTM E779 primarily focuses on the measurement of air leakage rates through the building envelope using a standardized procedure for whole-building air leakage testing, but it does not include provisions for testing the building enclosure specifically.

In contrast, the other options include standards that do provide methods or criteria for testing building enclosures. For example, USACE 2012 acknowledges testing related to building enclosures, while ISO 9972:2015 also addresses the assessment of airtightness of the building envelope. ASHRAE 62.1, focusing on ventilation and acceptable indoor air quality, ensures that building enclosures maintain appropriate airleakage control to uphold ventilation success.

Understanding these subtleties in each standard's focus helps clarify which ones incorporate building enclosure testing versus those that do not, emphasizing ASTM E779's specific focus on air leakage measurement without addressing the broader context of an entire building enclosure.