本标准规定了永久管道系统中安装的自动和开放式喷水喷嘴的FM Approvals标准，这些系统旨在保护传统喷水系统无法充分保护的危险

This standard states FM Apporvals criteria for automatic and open water-spray nozzles installed in permanently piped systems which are intended to protect a hazard that cannot adequately be protected by a convetional sprinkler system