This project is a CAD reference drawing for civil air defense HVAC design, including 1. design description of ambulance station, fixed diesel generator, professional team, man shelter, material warehouse, mobile diesel generator, schematic diagram, plan of air inlet and outlet, and details of machine room. 2. Relevant calculation Excel tables, including clean ventilation, poison filtering ventilation, isolation ventilation calculation, and explosion-proof wave activity from the probe of the poison alarm to the inlet air