1.1 本试验方法涵盖了用于测量通过建筑围护结构的空气泄漏率的风扇增压系统的气流测量校准技术。 1.2 本试验方法适用于《试验方法》中所述的用于空气泄漏测量的系统 E779 ， E1827 ， E3158 和ANSI/RESNET/ICC 380。 1.3 该测试方法包括在校准室内安装风扇增压系统。在实际建筑中使用风扇增压系统可能会由于操作员的影响、内部隔断和家具的干扰、天气影响和其他因素而在气流测量中引入额外的误差。 1.4 正确使用此测试方法需要了解气流和压力测量的原理。 1.5 本标准包括两个基本程序，一个是基于ASHRAE的首选程序 51/AMCA 210，以及一种基于非标准气流测量技术的可选程序，该技术通常由风扇加压装置的制造商使用，但尚未与标准气流测量方法进行比较。 1.6 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.7 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。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 风机增压程序可相对快速地评估建筑围护结构的气密性。为了知道测试结果的准确性，必须校准风扇增压系统的气流速率测量技术。 5.2 本试验方法适用于安装在建筑围护结构开口中的风机增压系统，而不是涉及建筑机械通风系统的增压技术。 5.3 建筑增压测试技术对风机增压系统的校准提出了具体要求。校准必须涵盖风扇压差的范围（约12.5 Pa至75 Pa）。校准还必须涵盖与风机增压系统在现场遇到的建筑尺寸和气密性范围相对应的风机气流速率范围。 5.4 如果系统气流方向是可逆的，则必须在用于对建筑物加压和减压的气流的两个方向上校准风扇加压系统。这两个校准可以使用本测试方法中描述的各种设置进行；然而，可以组合一些设置，使得可以使用单个校准设施在两个方向上校准风扇。 这种单一设置可能涉及将风扇加压系统从腔室的一端移动到另一端，在腔室的同一端反转系统的方向，或者可能根本不需要移动系统。 5.5 校准技术适用于使用中的两种基本类型的风机增压系统，即转速门和信号门。 5.6 对于在多个气流速率范围内运行的风扇增压系统，必须在每个范围内对系统进行校准。 5.7 校准技术旨在提供风扇增压系统的完整校准。在校准了具有相同或相似设计的几个系统之后，可以发现风扇气流速率独立于某些参数，例如风扇压差。可以观察到风扇气流速率与风扇速度或风扇信号之间的其他简化关系。如果观察到这些关系，制造商或其他校准器可以选择通过减少校准点的数量来简化校准程序。 5.8 在实际建筑中使用风扇加压系统会引入额外的因素，这些因素可能会导致气流速率测量中的误差，而校准没有考虑这些误差。这些因素包括操作员和天气影响以及内部隔板和其他障碍物的干扰。

1.1 This test method covers the airflow measurement calibration techniques for fan pressurization systems used for measuring air leakage rates through building envelopes. 1.2 This test method is applicable to systems used for air leakage measurement as described in Test Methods E779 , E1827 , E3158 , and ANSI/RESNET/ICC 380. 1.3 This test method involves the installation of the fan pressurization system in a calibration chamber. Use of the fan pressurization system in an actual building may introduce additional errors in the airflow measurement due to operator influence, interference of internal partitions and furnishings, weather effects, and other factors. 1.4 The proper use of this test method requires a knowledge of the principles of airflow and pressure measurement. 1.5 This standard includes two basic procedures, a preferred procedure, based on ASHRAE 51/AMCA 210, and an optional procedure based on a nonstandard airflow measurement technique, commonly used by manufacturers of fan pressurization devices, but which has not been compared with standard airflow measurement techniques. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. 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 fan pressurization procedure provides a relatively fast evaluation of the airtightness of building envelopes. In order for the accuracy of the test results to be known, the airflow rate measurement technique of the fan pressurization system must be calibrated. 5.2 This test method is applicable to fan pressurization systems that are installed in an opening in the building envelope, as opposed to pressurization techniques involving the mechanical ventilation system of the building. 5.3 The technique of pressurization testing of buildings puts specific requirements on the calibration of fan pressurization systems. The calibration must cover the range of fan pressure differences (approximately 12.5 Pa to 75 Pa) that is induced during pressurization tests. The calibration must also cover a range in fan airflow rates corresponding to the range in building size and airtightness that the fan pressurization system will encounter in the field. 5.4 The fan pressurization system must be calibrated in both directions of airflow used to pressurize and depressurize a building if the system airflow direction is reversible. These two calibrations can be conducted using the various setups described in this test method; however some of the setups can be combined such that a single calibration facility can be used to calibrate the fan in both directions. Such a single setup may involve moving the fan pressurization system from one end of the chamber to the other, reversing the orientation of the system at the same end of the chamber, or it may not require moving the system at all. 5.5 The calibration technique is applicable to the two basic types of fan pressurization systems in use, r/min doors and signal doors. 5.6 For fan pressurization systems that operate in multiple ranges of airflow rate, the system must be calibrated in each range. 5.7 The calibration technique is intended to provide a complete calibration of a fan pressurization system. After calibrating several systems of an identical or similar design, the fan airflow rate may be found to be independent of certain parameters such as fan pressure difference. Other simplifying relations between fan airflow rate and fan speed or fan signal may be observed. If these relations are observed, a manufacturer or other calibrator may choose to simplify the calibration procedure by reducing the number of calibration points. 5.8 The use of fan pressurization systems in actual buildings introduces additional factors that may cause errors in the airflow rate measurement that are not accounted for by the calibration. These factors include operator and weather effects and interference from internal partitions and other obstructions.