Civil Air Defense | Article 7.
4.
8 of the “Design Code for Civil Air Defense Engineering Combining Peace and War” DB11/994-2021: 4-6 spare protective pipes should be embedded in the door frame walls and door frame walls of all personnel entrances, exits, and connecting ports, and should meet the requirements of protective sealing.
Is it necessary to embed spare protective pipes on the door frame wall of the protective airtight door set at the usual passage entrance on the protective airtight partition wall between the adjacent protective units of the civil air defense project, which is usually a garage?.