How to deal with IfcSpace using Revit 2020

https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcproductextension/lexical/ifcspace.htm

A space represents an area or volume bounded actually or theoretically. Spaces are areas or volumes that provide for certain functions within a building.

Figure 1 Prepair a Revit Room (or Area) for IFC export

Number and Name are default parameters

Figure 2 Note, that if IFC (3D view activated) export only elements visible in view is checked, the option export rooms, areas and spaces in 3D views should be also checked on.

Figure 3 Result in IFC shown in BIM vision.

Remarks:

Revit Number is automatic mapped to Ifc as property Name
Revit Name is automatic mapped to Ifc as property LongName
Note: Revit exports the parameters also to Identity Data if Export Revit property sets is selected by IFC export settings.
By using the parameters IfcName and IfcLongName you can override the values, see next figures.