1.1 本试验方法提供了一个标准的实验室程序，用于在规定的空气温度和压力差条件下，在整个试样上测定外窗、幕墙和门的空气泄漏率。 1.2 规定的温度和压力条件代表了建筑物外部热围护结构可能遇到的条件，不包括太阳辐射引起的热量积聚的影响。 1.3 本实验室程序适用于外部窗户、幕墙和门，仅用于测量与组件相关的泄漏，而非安装；然而，测试方法可以用于后一目的。 1.4 这是在不同温度条件下进行测试的实验室程序。对环境条件下实验室测试感兴趣的人员应参考测试方法 第283页 。对已安装门窗的现场试验感兴趣的人员应参考试验方法 电子783 . 1.5 使用本程序的人员应熟悉传热、流体力学和仪表实践领域，并对开窗产品和组件有一般了解。 1.6 以国际单位表示的数值视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 有关具体危险说明，请参见第节 7. . 1.8 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 外部建筑围护结构及其组件（例如，窗户和门）将内部空调空间与外部环境因素（如热、冷、雨、风、噪音、灰尘等）隔开。环境空气温度的波动会通过改变天气密封压缩比来改变窗户、幕墙和门的密封特性。框架材料的热膨胀或收缩，再加上产品中温度梯度引起的热吹气，以及密封收缩和压缩变形引起的有效泄漏区域的变化，也会显著改变这些产品在现场应用中的空气泄漏率。 使用试验方法进行空气泄漏试验 第283页 （在环境温度条件下进行的实验室空气泄漏试验）不能准确解释因窗户系统、材料和组件的尺寸变化而可能发生的空气泄漏率变化。 5.2 建议试验规范制定者咨询制造商，了解推荐的试验温度极限值。 5.3 本程序提供了一种评估不同温度和压力条件下以及气流方向下开窗系统漏气率的方法。它也适用于评估开窗系统中天气密封产品的效率。将所有空气流速转换为标准条件，以提供在不同环境空气温度和压力条件下进行测量的比较方法。 5.4 漏气率有时用于比较目的。除非被测试和比较的部件具有基本相同的尺寸、配置和设计，否则此类比较可能无效。

1.1 This test method provides a standard laboratory procedure for determining the air leakage rates of exterior windows, curtain walls, and doors under specified differential air temperature and pressure conditions across the specimen. 1.2 Specified temperature and pressure conditions are representative of those that may be encountered at the exterior thermal envelope of buildings, excluding the effects of heat buildup due to solar radiation. 1.3 This laboratory procedure is applicable to exterior windows, curtain walls, and doors and is intended to measure only such leakage associated with the assembly and not the installation; however, the test method can be adapted for the latter purpose. 1.4 This is a laboratory procedure for testing at differential temperature conditions. Persons interested in a laboratory test at ambient conditions should reference Test Method E283 . Persons interested in a field test on installed windows and doors should reference Test Method E783 . 1.5 Persons using this procedure should be knowledgeable in the areas of heat transfer, fluid mechanics, and instrumentation practices, and shall have a general understanding of fenestration products and components. 1.6 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. 1.7 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 . 1.8 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 The exterior building envelope and its components (for example, windows and doors) separate the interior conditioned spaces from exterior environmental factors such as heat, cold, rain, wind, noise dust, etc. Building materials and components can expand or contract to varying degrees, depending on seasonal and diurnal exterior ambient air temperatures. Fluctuations in the ambient air temperatures can alter the sealing characteristics of windows, curtain walls, and doors by changing weather seal compression ratios. Thermal expansion or contraction of framing materials coupled with thermal blowing due to temperature gradients through the product, and alterations in the effective leakage areas due to weather seal shrinkage and compression set, can also significantly alter the air leakage rates of these products in field service applications. Air leakage tests performed using Test Method E283 (a laboratory air leakage test performed at ambient temperature conditions) will not account accurately for changes in air leakage rates that may occur from dimensional changes in fenestration systems, materials, and components. 5.2 It is recommended that test specifiers consult the manufacturer for recommended test temperature extremes. 5.3 This procedure provides a means for evaluating air leakage rates of fenestration systems under various temperature and pressure conditions and air flow directions. It is also applicable for use in evaluating the efficiency of weather sealing products in fenestration systems. All air flow rates are converted to standard conditions to provide a means of comparison between measurements made at different ambient air temperature and pressure conditions. 5.4 Air leakage rates are sometimes used for comparison purposes. Such comparisons may not be valid unless the components being tested and compared are of essentially the same size, configuration, and design.