Modular frame panel, ZS 50, OT 80, hfr, light grey. Frame panel for parapet duct, modularly stackable at a combination distance of 71 mm, conceals cuts to the upper section of the duct. For accommodating central panels, 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 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 panel for parapet duct using an optional intermediate piece.