ASTM-E779 Historical Revision Information
Standard Test Method for Determining Air Leakage Rate by Fan Pressurization

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Standard Test Method for Determining Air Leakage Rate by Fan Pressurization


1.1 This test method describes a standardized technique for measuring air-leakage rates through a building envelope under controlled pressurization and de-pressurization.

1.2 This test method is applicable to small temperature differentials and low-wind pressure conditions. For tests conducted in the field, it must be recognized that field conditions may be less than ideal. Nevertheless, strong winds and large indoor-outdoor temperature differentials should be avoided.

1.3 The proper use of this test method requires a knowledge of the principles of air flow and pressure measurements.

1.4 This test method is intended to produce a measure of air tightness of a building envelope. Because of differences between natural load and test conditions, however, such measurements cannot be interpreted as direct measurements of air change rates that would occur under natural conditions.

1.5 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements see Section 7.


Air leakage testing-building materials/constructions; Building constructions/materials-envelopes; Fan pressurization method; Leak testing; Leak testing-building constructions/materials; air leakage rate through building envelopes, by fan pressurization,; test; ICS Number Code 91.140.30 (Ventilation and air-conditioning systems)

To find similar documents by ASTM Volume:

04.11 (Building Constructions (I): E72 - E2110)

To find similar documents by classification:

91.140.30 (Ventilation and air-conditioning systems Including ventilation ducts Ventilators and air-conditioners, see 23.120)

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Document Number


Revision Level

1987 R92(E1) EDITION



Modification Type


Publication Date

Dec. 1, 1991

Document Type

Test Method

Page Count

4 pages

Committee Number