This enumeration is used to identify the primary purpose of a duct segment. This is a very basic categorization mechanism to generically identify the duct segment type. Subcategories of duct segments are not enumerated.
A flexible segment is a continuous non-linear segment of duct that can be deformed and change the direction of flow.
A rigid segment is a continuous linear segment of duct that cannot be deformed.
TYPE IfcDuctSegmentTypeEnum = ENUMERATION OF