本英国标准规定了预期使用的闭路呼吸器（CCBA）的要求 用于灭火、救援、疏散、逃生、危险控制和去污， 以及应急响应人员（如消防、救护车、警察和相关文职人员）的类似活动 机构和工人）在含有化学、生物、放射性和放射性物质并受其污染的区域 核（CBRN）试剂。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This British Standard specifies requirements for closed-circuit breathing apparatus (CCBA) intended to be used during fire-fighting, rescue, evacuation, escape, hazard containment and decontamination, and similar activities by emergency responders (e.g. fire, ambulance, police, and associated civilian agencies and workers) in areas containing and contaminated by chemical, biological, radiological and nuclear (CBRN) agents.All current amendments available at time of purchase are included with the purchase of this document.