The exhaust shaft can be found in the Material Library.
As its name suggests, the air duct is used to exhaust air. They are installed wherever exhaust is required. General basement ventilation rooms, diesel generator rooms, etc. Locations on the floor where a pressurized air supply is required in the room in front of the fire and in the stairwell.
Use a loadable family in a project or model. Once the family is loaded into a project, it will be saved with the project. However, sometimes after loading a family file into a project, we do not understand its "family category" and cannot quickly find and organize related families in the ribbon. Faced with this situation, there are generally two methods to resolve it: switch to the "Building", "Structure" or "System" tab and find the "Component" function tool.