What is the standard test method for determining air leakage rate by fan pressurization?

The standard test method for determining air leakage rate by fan pressurization is indeed ASTM E779. This standard outlines the procedures for measuring the air leakage rate of buildings and other enclosures and is widely recognized in the industry for its systematic approach. ASTM E779 employs the use of a fan to create a pressure difference between the inside and outside of the building, allowing for the quantification of air leakage through various building envelope components.

Given its established methodologies, ASTM E779 ensures consistency and reliability in measuring air tightness, making it a cornerstone for professionals involved in energy efficiency and building performance assessment. The test is designed to evaluate how well a building's airtightness meets sustainability standards or regulatory requirements, ultimately contributing to the overall energy efficiency and comfort of indoor environments.

While other standards, such as ASTM E1827 and ISO 9972, may deal with related topics, they focus on different aspects or utilize alternative methods for measuring air leakage, making ASTM E779 the definitive choice for the specified method of air leakage determination through fan pressurization.