Any point where air pressure remains after the supply is turned off. You will need to make a pressure relief valve and install a residual pressure indicator as well. (Please contact Eng. Supply part for me.)
After turning off the power, all areas that may have static pressure must be equipped with pressure relief valves and static pressure indicators. (English)
After turning off the power supply, all points where constant wind pressure can exist must be equipped with pressure leakage valves and constant pressure status indicators (Eng interference). Supplies parts)