本欧洲标准规定了用于防火系统的氧气还原系统，该系统通过在环境条件下具有较低的永久氧气浓度的区域内创造大气。氧还原水平由这些区域的个别风险确定（见附录A）。氧气还原是通过技术系统来实现的，这些系统提供的空气流量含有降低的氧气浓度。 本欧洲标准 规定了最低要求，并规定了建筑和工业生产装置中使用氧气还原空气的固定式氧气还原系统的设计、安装和维护规范。本标准也适用于现有系统的扩展和修改。 本欧洲标准适用于使用氮气的氧气还原系统，该系统设计用于封闭空间内的连续氧气还原。 注:今天是氮气 最适合用于氧气还原的气体。对于其他气体，本欧洲标准可作为基础。 本欧洲标准不适用于使用细水雾或燃烧气体的氧气还原系统。 欧洲标准不适用于: -爆炸抑制系统； -防爆系统； -使用气体灭火剂的灭火系统； -便携式容器的惰性化； -含氧量的系统 由于防火以外的原因而减少（例如在惰性气体存在下进行钢加工，以避免形成氧化膜）； -在系统或设备（如焊接）的维修工作中需要惰性化，以消除火灾或爆炸的风险。 除了实际氧还原系统及其单个组件的条件外，本欧洲标准还包括保护区的某些结构规范。 由氧气还原系统保护的空间是一个可控制和持续监测的室内气候，可供长期居住。本标准不包括可能含有有害气体的密闭空间。

This European standard specifies oxygen reduction systems that are used as fire prevention systems by creating an atmosphere in an area which is having a lower permanent oxygen concentration as in ambient conditions. The level of oxygen reduction is defined by the individual risks of these areas (see Annex A). Oxygen reduction is achieved by technical systems which are providing a flux of air containing a reduced concentration of oxygen. This European standard specifies minimum requirements and defines the specifications governing the design, installation and maintenance of fixed oxygen reduction systems with oxygen reduced air in buildings and industrial production plants. The standard also applies to the extension and modification of existing systems. This European standard applies to oxygen reduction systems using nitrogen which are designed for continual oxygen reduction in enclosed spaces. NOTE Nitrogen is today the most suitable gas to be used for oxygen reduction. For other gases this European standard can be used as basis. This European standard does not apply to oxygen reduction systems that use water mist or combustion gases. The European standard does not apply to: - explosion suppression systems; - explosion prevention systems; - fire extinguishing systems using gaseous extinguishing agents; - inertization of portable containers; - systems in which oxygen levels are reduced for reasons other than fire prevention (e.g. steel processing in the presence of inert gas to avoid the formation of oxide film); - inerting required during repair work on systems or equipment (e.g. welding) in order to eliminate the risk of fire or explosion. In addition to the conditions for the actual oxygen reduction system and its individual components this European standard also covers certain structural specifications for the protected area. The space protected by an oxygen reduction system is a controlled and continuously monitored indoor climate for extended occupation. This standard does not cover unventilated confined spaces that may contain hazardous gases.