What maximum induced pressure differentiation should not be exceeded according to USACE?

The correct choice is based on guidelines established by the United States Army Corps of Engineers (USACE) which emphasize the importance of maintaining appropriate induced pressure differentials during airtightness testing. The limit of 30% of the minimum induced pressure difference is designed to ensure that the testing maintains a standardized level of accuracy and reliability. Exceeding this percentage can lead to inaccuracies in the testing results, as larger pressure differentials can result in unintended airflow patterns and pressure fluctuations that distort the assessment of a building’s airtightness.

By adhering to this 30% guideline, testers can ensure that the conditions under which the building is tested remain controlled and representative of actual performance. This standard is put in place to promote consistency across testing scenarios, which leads to better comparability of results and adherence to safety standards in construction and evaluation processes. Thus, this specific criterion helps prevent overly aggressive testing conditions that could otherwise compromise the validity of the results gathered from airtightness tests.