IfcPermeableCoveringOperationEnum

Definition from IAI: Enumeration defining the valid types of permeable coverings.

Enumeration:

GRILL | protective screen of metal bars or wires
LOUVER | set of fixed or movable strips of wood, metal, etc. arranged to let air in while keeping light or rain out
SCREEN | upright, fixed or movable, sometimes folding framework used for protection against heat, light, access or similar
USERDEFINED | user defined permeable covering type
NOTDEFINED | no information available

> HISTORY: New Enumeration in IFC Release 2.0

EXPRESS specification:

TYPE IfcPermeableCoveringOperationEnum = ENUMERATION OF
( | GRILL, LOUVER, SCREEN, USERDEFINED, NOTDEFINED);
END_TYPE;