Not necessarily. The wartime civil air defense air inlet engine room air duct does not need to be connected to the normal air duct. The wartime ventilation system may share a set of air ducts with the normal ventilation system, but there should be some in wartime. conversion measurements, and there are no connections on the schematic diagram. Civil air defense refers to measures and actions taken by the government to mobilize and organize the population in order to defend against enemy air attacks and eliminate their consequences.
If it is a short-term civil protection installation, there is no need to build a special soundproof wall.
If it is a long-term civil air defense installation (working, living, studying and commanding in a long-term civil air defense installationrre, etc.), a soundproof wall is required. Wrap the fan room leaving only one vent connected to the civil air defense facilities, and the air inlet and outlet should also be soundproofed.