Ducts, not of metal, for ventilating and air-conditioning installations; Non-metal ventilating ducts; Interior non-metal window shutters; Window frames, sashes and casements of wood clad in aluminum; Hardwood flooring; Glass for building; Fireproof cement coatings; Tiles of clay, glass, gypsum, ceramic or earthenware; Mosaic art tiles made of marble; Armoured doors, not of metal