Recommendedusage:FangdunEasy-ClipHalfMask+2102NKN100filtercotton.
    Replacementsuggestions:Theservicelifeofthemaskisover365days(sparepartscanbereplacedifdamaged).Thefiltercottonshouldbereplacedpromptlywhencontaminationisobservedthroughtheviewingwindoworwhenyoufeelstuffywhilebreathing.
    Forexample,inundergroundcoal-mineoperations,theaveragedustconcentrationisgenerallyabove450mg/m³.Themainhazardisinhalablefreedust(particlesize<5μm).Whenworkinginanenvironmentwiththisdustconcentrationfor8hours,itisrecommendedtoreplacetheKN100filtercottoneveryabout25days.