Floor duct flush with screed with foil sheet steel BKF 400x(105-150)mm. Screed-flush installation duct according to DIN EN 50085-1 and DIN EN 50085-2-2, with flexible foil formwork, consisting of: channel side profiles made of aluminum, crossbeams, screed anchors, floor covering attachment profiles (0 or 4 mm) made of plastic, leveling clamps with channel connectors and leveling pins, screwed blind covers, suitable for dry-maintained floors, acoustically decoupled, pre-assembled at the factory.