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
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试验数据进行分类:耐火导管和防火挡板