2021UNE-EN 352-5:2020 Hearing protectors - Safety requirements - Part 5: Active noise reduction earmuffs (Endorsed by Asociación Española de Normalización in March of 2021.)
2006UNE-EN 352-5:2003/A1:2006 Hearing protectors - Safety requirements and testing - Part 5: Active noise reduction ear-muffs
2003UNE-EN 352-5:2003 Hearing protectors - Safety requirements and testing - Part 5: Active noise reduction ear-muffs