Pset_CoveringCeilingDefinition from IAI: Properties common to the definition of all occurrences of IfcCovering with the PredefinedType set to CEILING.IfcCovering entity.IFCPRODUCTEXTENSION/IfcCoveringIfcCovering.PredefinedType="CEILING"PermeabilityRatio of the permeability of the ceiling. The ration can be used to indicate an open ceiling (that enables identification of whether ceiling construction should be considered as impeding distribution of sprinkler water, light etc. from installations within the ceiling area).DurchlässigkeitProperty Definition in GermanTileLengthLength of ceiling tiles. The size information is provided in addition to the shape representation and the geometric parameters used within. In cases of inconsistency between the geometric parameters and the size properties, provided in the attached property set, the geometric parameters take precedence. Deckenplatte - LängeProperty Definition in GermanTileWidthWidth of ceiling tiles. The size information is provided in addition to the shape representation and the geometric parameters used within. In cases of inconsistency between the geometric parameters and the size properties, provided in the attached property set, the geometric parameters take precedence. Deckenplatte - BreiteProperty Definition in GermanProperty Set Definition in German