Chogulitsacho chimagwira ntchito pa EN149 muyeso woyeserera: chipangizo choteteza chopumira-chosefera anti-particle semi-mask; TS EN 149: 2001+A1: 2009 Zofunikira pa chipangizo choteteza kupuma, zosefera zotsutsana ndi tinthu tating'onoting'ono ta theka-mask chizindikiro 8.10 kutsekereza mayeso, EN143 7.13 ndi miyezo ina yoyesera.
Mfundo yoletsa kuyesa: fyuluta ndi mask blocking tester imagwiritsidwa ntchito kuyesa kuchuluka kwa fumbi lomwe lasonkhanitsidwa pa fyuluta, kukana kupuma kwa chitsanzo choyesera ndi kulowa kwa fyuluta (permeability) pamene kutuluka kwa mpweya kumadutsa fyulutayo poyamwa zina. fumbi chilengedwe ndi kufika ena kupuma kukana.