EN ISO 21904-2:2020 焊接和相關工藝中的健康和安全.焊接煙塵捕集和分離設備.第2部分:分離效率的試驗和標記要求
Health and safety in welding and allied processes - Equipment for capture and separation of welding fume - Part 2: Requirements for testing and marking of separation efficiency (ISO 21904-2:2020)