Door or Window Element

A window or door element comprising:

• a frame assembly;
• wherein the frame assembly comprises an outer frame assembly, an inner frame assembly, and an insulating body assembly positioned between said outer frame assembly and said inner frame assembly, using sandwich construction;
• an insulated glass unit is disposed between said inner frame assembly and said outer frame assembly, and said insulated glass unit includes a first windowpane and a second windowpane that are spaced apart to create a sealed air space therebetween;
• a series of mounting tabs are attached to an inner surface of said outer frame assembly;
• a series of mounting tabs are attached to an inner surface of said inner frame assembly, and each mounting tab defines a hole therethrough for receiving a mechanical fastener;
• said insulating body assembly includes a first series of corresponding slots on a first side thereof for receiving mounting tabs connected to said outer frame assembly, and a second series of corresponding slots on a second side thereof for receiving mounting tabs connected to said inner frame assembly;
• and
• wherein said mechanical fasteners are disposed through said holes defined by said mounting tabs to connect said mounting tabs to said insulating body assembly.