Samfurin yana aiki da ma'aunin gwajin EN149: na'urar kariya ta numfashi-tace anti-barbashi Semi-mask; Daidaita ka'idoji: TS EN 149: 2001 + A1: 2009 Na'urar kariya ta numfashi - tace anti-barbashi da buƙatun buƙatun abin rufe fuska 8.10 gwajin toshewa, EN143 7.13 da sauran matakan gwaji.
Ka'idar gwajin toshewa: ana amfani da ma'aunin tacewa da abin rufe fuska don gwada adadin ƙurar da aka tattara akan tacewa, juriya na numfashi na samfurin gwajin da shigar matatar (permeability) lokacin da kwararar iska ta ratsa ta tace ta tsotsa a cikin wani takamaiman. yanayin ƙura kuma ya kai wani juriya na numfashi.