ASTM E3474-25

1.1 This test method provides a quantitative field test procedure and calculation method for assessing an air leakage rate using fan-induced pressure differentials across the test envelope and the surrounding building, generated by multiple blower doors or equivalent equipment.

1.2 Building setup conditions in accordance with defining the test boundaries appropriate for testing air leakage rate through a zone of a building are defined in this test method.

1.3 Procedures to determine the air pressure boundaries of the test envelope to be tested are provided in this test method.

1.4 This test method applies to measurement of the building envelope air leakage rate of a zone of a multizone building.

1.5 This test method defines three test procedures: multi-point regression, repeated single-point, and repeated two-point air leakage rate testing.

1.6 This test method allows for testing the test envelope in a pressurized condition, a depressurized condition, or in both conditions and averaging the results.

1.7 This test method applies to an air leakage rate test specification with a specified reference pressure greater than 10 Pa (0.04 in. W.C.) and not greater than 100 Pa (0.40 in. W.C.).

1.8 This test method describes two methods of preparation for the building in order to conduct the test: the building envelope where HVAC-related openings are excluded, and the operational envelope where the HVAC-related openings are included.

1.9 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.