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The U.S. Army Corps of Engineers (USACE) has taken a leading role in requiring field performance testing to measure and verify the air tightness of building enclosures. Some state and federal governing agencies as well as model building codes and standards include building air sealing requirements. However, these requirements are non-quantitative, and air sealing results are not required to be verified by testing. As a result, the benefits of enclosure air tightness are likely not achieved.