Chigadzirwa chinoshanda kune EN149 chiyero chekuyedza: kufema inodzivirira mudziyo-yakasefa anti-particle semi-mask; Zvinoenderana nezviyero: BS EN 149: 2001 + A1: 2009 Chishandiso chekudzivirira chekufema-sefa anti-particle semi-mask zvinodiwa test mark 8.10 blocking test, EN143 7.13 uye mamwe maitiro ebvunzo.
Kuvharira bvunzo musimboti: iyo sefa uye mask inovharira tester inoshandiswa kuyedza huwandu hweguruva rakaunganidzwa pasefa, kuramba kwekufema kweyeyedzo sampu uye kupinza kwesefa (permeability) kana kuyerera kwemhepo kuchipfuura nepasefa nekukweva mune imwe nzira. guruva nharaunda uye inosvika kumwe kufema kuramba.