Pset_DamperOccurrence Damper occurrence attributes attached to an instance of IfcDamper IfcDamper IfcDamper SizingMethod Identifies whether the damper is sized nominally or with exact measurements: NOMINAL: Nominal sizing method. EXACT: Exact sizing method. NOMINAL EXACT NOTKNOWN UNSET NOMINAL Nominal Nominal sizing method EXACT Exact Exact sizing method NOTKNOWN (unknown) Value is unknown. UNSET (unset) Value has not been specified. Sizing Method