Recommendedusage:Fangdunhalfmask+2202NKN100filtercotton.
    Replacementsuggestions:Theservicelifeofthemaskis>365days(sparepartscanbereplacedifthereisanydamage).Thefiltercottonshouldbereplacedinatimelymannerwhencontaminationisfoundthroughtheobservationwindoworwhenthereisafeelingofrespiratorystuffiness.Forexample,inmineswheremetalores,radioactiveoresaremined,andinminesthatproducematerialsusedaspetrochemicalrawmaterials,buildingmaterials,auxiliarymaterials,refractorymaterialsandothernon-metallicminerals(excludingcoal).Theaveragedustconcentrationisbetween300and400mg/m³,whichisextremelyharmfultothehumanbody.Whenworkinginsuchadustyenvironmentfor8hours,itisrecommendedtoreplacetheKN100filtercottoneveryabout15to20days.