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What are the nine types of filters and the respective efficiencies?

efficiencies filters respective types
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What are the nine types of filters and the respective efficiencies?

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NIOSH certifies three types of disposable particulate filters with three levels of filter efficiency, 95%, 99% and 99.97%, in each class. All filters are tested by utilizing the most penetrating aerosol size 0.3 micron (aerodynamic mass median diameter).

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