<p>This Architectural Drawing is AutoCAD 2d drawing of Mullion section details in AutoCAD, dwg file. A mullion wall is <strong>a structural system whereby the load of the floor slab is taken by prefabricated panels around the perimeter</strong>. They can be used for decorative purposes, or to allow the combination of smaller window units into larger compositions, or to provide structural support to an arch or lintel.</p>