防火阀 meaning in English

fire damper
fire resieting damper
fire resisting damper
fire-resisting damper

Fire resistance tests for service installations - fire dampers
服务设施的耐火试验.防火阀
Test method for smoke fire dampers
排烟防火阀试验方法
Fire dampers - test
防火阀试验方法
Fire - resistance tests - fire dampers for air distribution systems - intumescent fire dampers
耐火试验.用于空气分配系统的防火阀.膨胀防火阀
Fire - resistance tests - fire dampers for air distribution systems - test of thermal release mechanism
耐火试验.用于空气调节系统的防火阀.热释放装置试验

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