Escape apparatus for building fire—Part 2:Automatic and repetitive rescue controlled descent device
全国消防标准化技术委员会消防器具配件分技术委员会(SAC/TC 113/SC 5)
GB 21976的本部分规定了逃生缓降器（以下简称缓降器）的型号、技术要求、试验方法、检验规则、标志、包装、运输和贮存。
本部分适用于由调速器、绳索、安全带、安全钩、金属连接件和绳索卷盘组成，依靠使用者自重安全下降并能往复使用的缓降器。
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