DIN EN 13501-3 E:2002-02 施工产品和建筑部件的燃烧性能分类 第3部分:对建筑服务设施中使用的产品和部件的耐火试验数据进行分类:耐火管和防火挡板(草案)
Fire classification of construction products and building elements - Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: fire resisting ducts and fire dampers