These exterior wall covers are ideal for applications where concealment is desired, high wind loads are expected, or lateral shear is required. Infill (provided by others) can be used in various cladding systems, including metal, glass, and stone. XLS joint sizes range from 25" to 34". This system has a structural ladder frame assembly utilizing two heavy-duty magnetic closures and a pulley system returning the cover to the nominal position after a seismic event. Contact the factory for larger sizes or custom applications.