1.1 本规程涵盖了造船中经常使用的钣金HVAC管道形状的设计配置和描述性术语的识别。本规程还涵盖了这些形状的参数化尺寸。（参见 表1 .) 1.2 本规程不包括形状内接缝或接缝的位置或将形状连接在一起的方法。 1.3 由于本规程对测量不敏感，因此无论使用英寸-磅还是国际单位制尺寸，都适用。 1.4 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。 1.5 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====== 3.1 标准术语应用于促进HVAC通风管道系统组件的设计师、供应商和用户之间的沟通。 3.2 标准设计参数应用于定义通风管道形状。 3.3 设计参数的标准变量（参见 2.2 )有助于编写用于通风管道形状自动制造的CAD/CAM软件。

1.1 This practice covers the identification of design configurations and descriptive nomenclature for sheetmetal HVAC ductwork shapes frequently used in shipbuilding. This practice also covers parametric dimensions of these shapes. (See Table 1 .) 1.2 This practice does not cover the location of seams or joints within a shape or the method of joining shapes together. 1.3 Since this practice is not measurement sensitive, it is applicable whether inch-pound or SI metric dimensions are used. 1.4 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. 1.5 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 ====== 3.1 Standard nomenclature shall be used to facilitate communication between designers, suppliers, and users of HVAC ventilation ductwork components. 3.2 Standard design parameters shall be used to define ventilation ductwork shapes. 3.3 Standard variables for design parameters (see 2.2 ) are useful in writing CAD/CAM software for automatic fabrication of ventilation ductwork shapes.