NIOSH has established a classification system for respirators that appears as a letter followed by a number. The letter indicates the respirator’s resistance to oils while the number indicates the percentage of particles filtered out that measure .3 microns or larger in diameter. Learn more in this video.
Respirators 101 Knowledge Base Article: [ Ссылка ]
N95 Respirators and Facemasks: [ Ссылка ]
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N95 Respirators Explained
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