BS EN 352-1:2020 pdf free.Hearing protectors - General requirements. Earmuffs. BS EN 352-1 This document specifies requirements for construction, design, performance, marking and user information for earmuffs.In particular, it specifies requirements regarding the sound attenuation of the earmuffs, measured in accordance with EN ISO 4869-1:2018.The document does not apply to earmuffs outside the size range of headsizes as defined in...