A complete and highly accurate as-built documentation was required as a basis for the planning of the rebuild or installation. To avoid costly rework, 3D laser scanning was used to record the areas in question. The process proved to be fast, efficient and safe. Even areas that were difficult to access could be documented in detail thanks to the pinpoint accuracy of the recording. Laser scanning was used to generate real images of the scanned objects. These provided an optimum planning basis for precisely fitting prefabrication and consequently reduced the costs for conversion and installation. A laser scanner from FARO was used for this project. For the conversion of the filter system, 7 scans were made. A further 10 scans covered the heat exchanger. The mapping of the measurement results from the point cloud was done in FARO Scene. The point clouds were merged and then the floor plans were created. The final modeling of the resulting CAD data was done in Inventor. What was the contribution of PointCab Origins? In PointCab Origins, it was possible to quickly and easily define any sections in the floor plan. The subsequent import of the CAD data and its modeling in Inventor was surprisingly easy. Thus, thanks to PointCab Origins, an optimal planning basis was quickly created.