39,5 mm thick lining composed by 1 x 12,5 mm thick PregyFlam BA13, fixed to galvanized steel frame made of 28-28-28 mm horizontal U tracks and 27-49-27 mm S4927 vertical furring channel at 60 cm max spacing. According to fire test report, fire from the lining side only is allowed and maximum height is 4,00 m.