In Planon ProCenter, Area measurement standards such as the Dutch NEN 2580 are used to determine the net or gross area of a space if the enclosed holes or constructional elements are present. If the area of the enclosed hole/constructional elements is below the given threshold, their area is not subtracted from the surrounding space. Though it is not possible to maintain an entire standard in space norms, you can specify the thresholds for enclosed hole and constructional elements. On importing the AutoCAD drawings these thresholds are used to calculate the space area and in converting the drawing into a CAD Integrator .orj file.