EN 149 ndi muyezo waku Europe woyesa ndikuyika chizindikiro pakusefa theka la masks.Masks oterowo amaphimba mphuno, pakamwa ndi pachibwano ndipo amatha kukhala ndi ma valve opumira kapena / kapena mpweya.EN 149 imatanthawuza magulu atatu a masks omwe ali ndi theka, otchedwa FFP1, FFP2 ndi FFP3, (komwe FFP imayimira kusefa ...
Werengani zambiri