"Designed to have the case installed during the ""rough-in"" stages of construction and the fabric assembly during the finish stage.Tab guide cable system maintains even lateral tension to hold surface flat while custom slat bar with added weight maintains vertical tension.Front projection surfaces standard with black backing for opacity.For easy installation, the Tensioned Advantage® is available with SCB-100 or SCB-200 (RS-232 serial control board) built into the case.UL Plenum Rated case."