I was investigating an issue where a user stated that an area quantity for a door was incorrect. Looking at the output, the value actually matched the internal Revit value called “Area”, but then I realized that the Revit “Area” might not match the IFC Qto “Area”. The definition of the “Area” quantity for doors is:
“Total area of the outer lining of the door.”
The doesn’t clear things up, unfortunately. For a rectangular door, is area length x width? Is it the total surface area? Is it length x width x 2?