DIN EN 13501-3:2021 建筑产品和建筑构件的防火分类 第3部分:使用建筑服务设施中使用的产品和构件的耐火测试数据进行分类:耐火通风管道和防火阀和/或 pow
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 resistant ventilation ducts and fire dampers and or pow