1.1 本试验方法包括测定外部金属屋面板系统对正或负气压差引起的空气渗透的阻力。所述试验方法适用于整个试样的恒温恒湿试验。该测试方法是对测试方法的专门修改 E283年 . 1.2 本试验方法适用于任何屋顶区域。本试验方法旨在仅测量与屋顶现场相关的空气泄漏，包括面板侧搭接和结构连接；它不包括开口或周边的泄漏或任何其他细节。 1.3 正确使用该测试方法需要了解空气流量和压力测量原理。 1.4 本试验方法参考注释和脚注，不包括提供解释材料的表格和图。这些注释和脚注不应视为试验方法的要求。 1.5 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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。 有关具体的预防说明，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 本试验方法是在规定气压差下确定漏气特性的标准程序。 注1: 作用在建筑围护结构上的气压差变化很大。文献中讨论了屋顶坡度和其他影响气压差的因素，以及由此产生的空气泄漏对建筑物内环境的影响。 4. , 5. , 6. 在规定要使用的试验压差时，应充分考虑这些因素。 注2: 当应用本试验方法的试验结果时，请注意，屋顶或其部件的性能，或两者的性能，可能是正确安装和调整的功能。使用性能还取决于支撑结构的刚度、内部处理的存在、屋顶坡度以及部件对各种原因（腐蚀性大气、老化、结冰、振动、热膨胀和收缩）劣化的抵抗力，等等。很难模拟服务中可能遇到的相同复杂环境条件，包括阵风引起的压力快速变化。 一些设计比其他设计对这些环境条件更敏感。 5.2 空气泄漏率有时用于比较目的。除非被测试和比较的组件具有基本相同的尺寸、配置和设计，否则比较并不总是有效的。 注3: 中讨论的样本结构 1.2 并在 8.1 隔离泄漏源。试验方法期间测量的漏气率单位为立方英尺/分钟/平方英尺（升/秒/平方米）。不包括开口和细节，例如端部搭接或屋顶路缘石，因为在这些条件下，更适合以每分钟每英尺（每秒公升/米）的立方英尺来测量泄漏。 试样面积相对较小；与实际屋顶结构相比，细节的加入将给细节的存在带来不切实际的影响。不得单独依赖本试验方法得出有关金属屋顶整体漏气的结论。屋顶包含许多细节。尽管规定的修改不在本测试方法的范围内，但经验丰富的测试工程师能够使用测试方法中提出的原则，并通过隔离特定细节和测量泄漏来生成重要数据。 如果包含详细信息，则引入其他泄漏源。如果然后测量总泄漏量，与没有细节的测试相比，结果通常是保守的。 为了尽量减少测试次数，当需要定性或一般定量结果时，说明符可以允许细节，例如端部搭接，并且性能不需要隔离来源。只允许一个面板端搭接。如果包括端搭接，用户在比较替代系统时应注意偏差。 注4: 这是一个测试程序。在考虑试验方法指南后，指定机构有责任确定试样结构、尺寸和试验压力。实际考虑表明，为了证实产品性能，无需测试面板厚度、跨度和设计载荷的每个组合。

1.1 This test method covers the determination of the resistance of exterior metal roof panel systems to air infiltration resulting from either positive or negative air pressure differences. The test method described is for tests with constant temperature and humidity across the specimen. This test method is a specialized adaption of Test Method E283 . 1.2 This test method is applicable to any roof area. This test method is intended to measure only the air leakage associated with the field of the roof, including the panel side laps and structural connections; it does not include leakage at the openings or perimeter or any other details. 1.3 The proper use of this test method requires knowledge of the principles of air flow and pressure measurements. 1.4 The text of this test method references notes and footnotes excluding tables and figures, which provide explanatory material. These notes and footnotes shall not be considered to be requirements of the test method. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 precautionary 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 This test method is a standard procedure for determining air leakage characteristics under specified air pressure differences. Note 1: The air pressure differences acting across a building envelope vary greatly. The slope of the roof and other factors affecting air pressure differences and the implications of the resulting air leakage relative to the environment within buildings are discussed in the literature. 4 , 5 , 6 These factors shall be considered fully when specifying the test pressure difference to be used. Note 2: When applying the results of tests by this test method, note that the performance of a roof or its components, or both, may be a function of proper installation and adjustment. The performance in service will also depend on the rigidity of supporting construction, the presence of interior treatments, the roof slope, and the resistance of components to deterioration by various causes: corrosive atmospheres, aging, ice, vibration, thermal expansion, and contraction, etc. It is difficult to simulate the identical complex environmental conditions that can be encountered in service, including rapidly changing pressures due to wind gusting. Some designs are more sensitive than others to these environmental conditions. 5.2 Rates of air leakage are sometimes used for comparison purposes. The comparisons are not always valid unless the components being tested and compared are of essentially the same size, configuration, and design. Note 3: The specimen construction discussed in 1.2 and required in 8.1 isolates a source of leakage. The rate of air leakage measured during the test method has units of cubic feet per minute per square foot (litres per second per square metre). Openings and details such as end laps or roof curbs are excluded since leakage is measured more appropriately in cubic feet per minute per foot (litres per second per metre) at these conditions. The test specimen area is relatively small; the inclusion of details will give unrealistic import to the detail's presence when compared to actual roof constructions. This test method shall not be relied on singularly to form conclusions about overall air leakage through metal roofs. A roof contains many details. Although prescribed modifications are outside the scope of this test method, an experienced testing engineer is able to use the principles presented in the test method and to generate significant data by isolating specific details and measuring leakage. Additional leakage sources are introduced if details are included. If total leakage is then measured, the results will generally be conservative relative to tests without details. To minimize the number of tests, the specifier may allow details such as end laps when qualitative or general quantitative results are desired and the isolation of sources is not required for performance. Only one panel end lap shall be allowed. The user shall be aware of the bias when comparing alternate systems if end laps are included. Note 4: This is a test procedure. It is the responsibility of the specifying agency to determine the specimen construction, size, and test pressures after considering the test methods' guidelines. Practical considerations suggest that every combination of panel thickness, span, and design load need not be tested in order to substantiate product performance.