Modular frame cover, BR, ZS 50, OT 100, hfr, pure white. Frame cover for parapet duct, modularly stackable at a combination distance of 71 mm, cut-concealed to the upper section of the duct. For accommodating central discs, covers, rockers or adapter frames from installation switch programs measuring 50 x 50 mm. Adapted to the outer contour of the parapet duct to reduce dirt deposits and to simplify cleaning. For use with stackable device boxes for parapet ducts, with reduced installation depth for flush closure with the closure contour of the parapet duct. Can be combined with socket cover for parapet duct using an optional intermediate piece.