ʻO EN 149 kahi kūlana ʻEulopa no ka hoʻāʻo ʻana a me ka hōʻailona ʻana i nā koi no ka kānana ʻana i ka hapalua masks.Uhi ia mau masks i ka ihu, ka waha a me ka ʻauwae a loaʻa paha nā kiwi inhalation a/a i ʻole exhalation.Ua wehewehe ʻo EN 149 i ʻekolu mau papa o ia mau mea huna hapa hapa, i kapa ʻia ʻo FFP1, FFP2 a me FFP3, (kahi i kū ai ʻo FFP no ka kānana ʻana i ka maka) e like me kā lākou kānana pono.Hoʻokaʻawale hoʻi ia i nā masks i 'hoʻohana hoʻohana hoʻokahi wale nō' (ʻaʻole hiki ke hoʻohana hou, marked NR) a i ʻole 're-usable (ʻoi aku ma mua o hoʻokahi hoʻololi)' (marked R), a ʻo kahi leka hou D e hōʻike ana ua hala kahi mask. ka ho'āʻo clogging koho me ka lepo dolomite.ʻO ia mau mea hoʻoheheʻe kānana mechanical e pale aku i ka inhalation o nā ʻāpana e like me nā ʻāpana lepo, droplets, a me nā aerosol.
