service duct meaning in Chinese

供应通道
装备槽

Fire resistance tests for service installations - service ducts and shafts
服务设施的防火试验.辅助通道和通风井
Fire resistance tests for service installations - part 5 : service ducts and shafts
服务设施的防火试验.第5部分:辅助管道和通风井
Fire resistance tests for service installations - part 5 : service ducts and shafts ; german version en 1366 - 5 : 2003
辅助设施的防火检验.第5部分:辅助通道和副井