Opera by Tredi is the series of high performance wooden fire doors which are REI 30 certified following the UNI 9723 standards. A model is also available which offers maximum acoustic insulation. Designed specifically for hotels the Opera door combines all the natural beauty of solid wood with the nest possible protection against fire. Opera is the first hotel door which conforms to the UNI 9723 standard, with a special certificate for its installation on prefabricated plasterboard partitions.