1. Each protection zone must be designed separately;
2. The design amount of fire extinguishing agent shall be determined according to the largest amount of fire extinguishing agent in the protective zone protected by the system. The protective zone with small amount of fire extinguishing agent shall be restricted by the safe concentration;
3. The selection valve can be installed upstream or downstream of the pressure reducing plate. If the pressure reducing orifice is upstream of the selection valve, the length from the pressure reducing orifice to the first tee should not be less than 10 times the pipe diameter;
4. When designing the manifold of the combined distribution system, a check valve must be installed on the starting line.