本标准采用ISO 17420 2:2021，并对澳大利亚和新西兰进行了修改。该标准规定了过滤式呼吸防护装置（RPD）的性能和测试要求，符合其分类，并用于工作场所，以保护佩戴者免受有害大气和/或环境的影响。本文件还规定了RPD元件和组件的要求。

This Standard adopts ISO 17420 2:2021 with modifications for Australia and New Zealand, which specifies requirements for the performance and testing of filtering respiratory protective devices (RPD) in accordance with their classification and for use in the workplace to protect the wearer from hazardous atmospheres and/or environments. Requirements for RPD elements and components are also specified in this document.