Ingabe imaski enevalvu yokuphefumula ingaba ngcono?

Ebusweni be-COVID-19, ukugqokaimaskisekuyiyona ndlela yokuvikela ebaluleke kakhulu. Amamaski e-KN95 anomphumela wokuvikela ophakeme phakathi kwamamaski amaningi. Amamaski e-KN95 kufanele agqokwe lapho ungena futhi uphuma ezindaweni ezinezingozi eziphakathi nendawo neziphezulu ukuze uthole ukuvikelwa okuphezulu. Wonke umuntu uyazi ukuthi kunezigaba ezinhlanu zamamaski e-KN95. Ngoba kunezinye izingqimba ezimbili zendwangu kunamamaski alahlwayo, futhi uhlangothi lwe-themask yakhelwe ukulingana ubuso ngokuphelele, imaski ye-KN95 izoba ingubo eyisicefe, futhi ukuphefumula kubi kakhulu. Abanye abantu bazokhetha imaski ye-KN95 enamavalvu okuphefumula.

Kodwa-ke, phakathi nesikhathi sokujwayelekile sokuvimbela nokulawula, akunconywa ukugqoka i-airspirator ene-valve yokuphefumula, ngoba umshini wokuphefumula one-valve yokuphefumula ukhiqiza umphumela wokuzivikela wendlela eyodwa. Uma umuntu ogulayo egqoke lolu hlobo lwemaski, abantu abaseduze kwakhe basengozini yokuthola lesi sifo.