Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 Articles of iron or steel 73 08 Structures (excluding prefabricated buildings of heading 94.06) and parts of str 73 08 30 Louvre type windows and their frames 73 08 30 10 Louvre type windows and their frames Commodity Code Description 73 08 30 10 00 - Doors, windows and their frames and thresholds for doors