DB3301/T 0221-2018 Technical regulations for operation and maintenance of secondary water supply facilities and equipment for high-rise residential buildings (English Version)
2023DB3301/T 0221-2023 Renovation and operation and maintenance specifications of secondary water supply facilities in high-rise residential buildings
2019DB3301/T 0221-2019 Technical regulations for operation and maintenance of secondary water supply facilities for high-rise residential buildings
2018DB3301/T 0221-2018 Technical regulations for operation and maintenance of secondary water supply facilities and equipment for high-rise residential buildings