1.1 本试验方法测量在受控加压和减压下通过建筑围护结构的空气泄漏率。 1.2 本试验方法适用于较小的温差和较低的风压差，因此应避免强风和较大的室内外温差。 1.3 本试验方法旨在量化建筑围护结构的气密性。本试验方法不测量正常天气条件和建筑物运行下的换气率或漏气率。 注1: 见测试方法 E741 使用示踪气体稀释法直接测量换气率。 1.4 本试验方法旨在用于测量单区建筑物围护结构的气密性。就本试验方法而言，许多多区域建筑可以通过打开内部门或在相邻区域中产生相等压力来视为单区域建筑。 1.5 本标准仅使用公制国际单位。如果测量值后跟括号中其他单位的值，则第二个值可能是近似值。第一个规定值是要求。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的危险说明，请参阅第节 7. . 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 空气泄漏占热空间调节负荷的很大一部分。此外，它还影响乘员舒适性和室内空气质量。 5.2 在大多数商业或工业建筑中，室外空气通常通过设计引入；然而，漏风是设计室外气流的重要补充。在大多数住宅建筑中，室内外空气交换主要归因于通过裂缝和施工缝的空气泄漏，并由温差、风、辅助风机（例如厨房和浴室排气）的运行以及建筑内燃烧设备的运行引起的压差引起。 5.3 风机增压方法比示踪气体测量简单，旨在表征建筑围护结构的气密性。它用于比较几个类似建筑物的相对气密性，以确定同一建筑围护结构不同部件的泄漏源和泄漏率，并确定对现有建筑物逐步应用的个别改造措施的漏气减少量，并结合天气和泄漏位置信息确定通风速率。

1.1 This test method measures 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 differential, therefore strong winds and large indoor-outdoor temperature differentials shall be avoided. 1.3 This test method is intended to quantify the air tightness of a building envelope. This test method does not measure air change rate or air leakage rate under normal weather conditions and building operation. Note 1: See Test Method E741 to directly measure air-change rates using the tracer gas dilution method. 1.4 This test method is intended to be used for measuring the air tightness of building envelopes of single-zone buildings. For the purpose of this test method, many multi-zone buildings can be treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones. 1.5 Only metric SI units of measurement are used in this standard. If a value for measurement is followed by a value in other units in parentheses, the second value may be approximate. The first stated value is the requirement. 1.6 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. For specific hazard statements see Section 7 . 1.7 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. ====== Significance And Use ====== 5.1 Air leakage accounts for a significant portion of the thermal space conditioning load. In addition, it affects occupant comfort and indoor air quality. 5.2 In most commercial or industrial buildings, outdoor air is often introduced by design; however, air leakage is a significant addition to the designed outdoor airflow. In most residential buildings, indoor-outdoor air exchange is attributable primarily to air leakage through cracks and construction joints and is induced by pressure differences due to temperature differences, wind, operation of auxiliary fans (for example, kitchen and bathroom exhausts), and the operation of combustion equipment in the building. 5.3 The fan-pressurization method is simpler than tracer gas measurements and is intended to characterize the air tightness of the building envelope. It is used to compare the relative air tightness of several similar buildings to identify the leakage sources and rates of leakage from different components of the same building envelope, and to determine the air leakage reduction for individual retrofit measures applied incrementally to an existing building, and to determine ventilation rates when combined with weather and leak location information.