The Combined Nomenclature (CN), v1:2024
9406 90 38: Buildings, prefabricated, whether or not complete or already assembled, made entirely or mainly of iron or steel (excl. mobile homes, greenhouses and modular building units)
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=ff35b666-b08b-41b5-bea1-78e213f89ca8