Physical objects in an IFC file must be categorised to a class of object, which has implications on what properties are expected to be found on the object. For example, a wall has an IFC class of IfcWall. If your BIM model has missing or incorrect class categorisations, then your BIM model becomes difficult to use for costing, sustainability quantification, automated scheduling, filtering maintainable assets for facility management, and more.

The classes available for you to use are different for each IFC version. In general, more recent IFC versions have more classes. This tool below lets you type what type of object you have, and it will try and find the right IFC class for you.

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