Returns the value of OverallHeight attribute. This attribute represents overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the window opening. If omitted, the OverallHeight should be taken from the geometric representation of the IfcOpening in which the window is inserted.

Returns the value of OverallHeight attribute.

The body of the window might be taller then the window opening (for example in cases where the window lining includes a casing). In these cases the OverallHeight is still specified as the window opening height, and not as the total height of the window lining.